I'm still going to lobby for Placidus, putting your nodes in the 4th/10th, as I think your response to dr. Farr fits very well with how I'm seeing my own nodes. Of course, you should go with the chart that seems to best speak to you about yourself.
That said, I was struck by how similar this was to my own experiences.
Curiously, I find it quite surprising that the NN often tends to be a lucky influence relative to the sign and house it's in. I come from a dysfunctional family so this is quite mind-boggling to me. The thought of my life's Karmic lesson being about becoming a leader and manager in that pandemonium is very unappealing to me. It's terrifying. Even just the thought of involving myself by trying to establish order sorta sounds like some version of human secrifice to me. The ill patterns are like a vacuum so chances are I would be sucked in, in no time. As it is, I rather not even consider "family" and "roots" a value. Values are also guiding principles because they likely form a solid core of who you are, what you believe, and where to be going forward. I refuse the place I come from to be what defines me. I believe in transformation. I've made up my mind that's something that I have to do for my mental and physical well being. I feel like disassociating from my background is what delivers a sense of liberation in and of itself. Like it's the only way forward. I guess this seems like going against my NN. Unless perhaps, this placement could be interpreted differently from another perspective. Maybe it all depends on the concept of home. Is home where blood ties you, or is it where you feel you belong? If it's a means of leaving a setting of abuse, and a means of establishing a secure environment, then perhaps feeling an overwhelming urge to overturn all of the home and domesticity settings to relocate and reinvent could actually be in line with my NN placement. I certainly hope so. I moved away a couple years ago. I stopped talking to my family. But I am struggling to completely break away. I haven't been able to cut all of my mental ties, I probably still have residual complexes and traumas. But now that they're not around I am really on my own and I find the peace of my newfound home is so comfortable I've been keeping to myself lately. Maybe I am cocooning myself from the world. But I would prefer to embrace it, so I guess being out there in the real world more often is what I need to work on.
That is, you're younger than me. What you've said here might better suite me 20 years ago. But if you read the thread I linked to, you saw I have a similar reaction to this Cap NN in 4th nodal placement. I too am very put off by the notion that this placement is all about domesticity and roots. That thread was all about me seeking for some deeper explanation. And now, with your account on this thread, I'm beginning to think there's something about this rejection of home life that is in fact a condition of the Cap NN in 4th.
First, my sense of how the nodes work in a chart has matured in recent months, I think. I think the nodes are pointing at something we are trying to learn in this life but they don't necessarily dominate the chart or tell the whole story. So when you said in another post that the Cancer SN seems off because you don't have much water in your chart, that's suggesting the notion that you "come from" Cancer and should expect a lot of water traits in your psyche (and therefore chart). I don't think it has to work that way. As an analogy, you can be naturally attuned to literature and languages but still have to take a class in science. So too, you can be all fire and air (as I am) and still set out to learn about the Cancer/Capricorn axis. And so that leads to a second way my thinking about the nodes has changed. I see the nodes now as presenting an axis that we have to learn how to balance much more than a line of trajectory where we're trying to get the heck away from the South Node while rocketing towards the North Node. So I don't see your nodal placement as a "contradiction" so much as the perfect placement for concentrating on how the two polarities of this axis (Cancer/ Capricorn axis, IC/MC axis) really work together.
In my own life, I really see the lesson this way: I have to learn that my grand ideas - and I'm very good at grand ideas - have to be manifest in the world through slow, methodical, step-by-step crafting and creating. A tree can reach to the sky but it must grow from the roots up. A book can be filled with brilliant ideas (air and fire) and feelings (water) but to actually exist as a book it has to be crafted and created page by page. That takes time, discipline and ultimately a kind of mastery of the Earth element. That's been one of the key tasks of my life...
In regards to family, I'm older now and suspect the nodal lesson might actually be to get the hell away from one's own dysfunctional family and learn later in life how to build your
own healthy family, from scratch. Where independence and self-mastery of becoming the pater familius of your own, newly started line (if you symbolically break from your bloodline) fits Capricorn to some degree. (Don't forget that Capricorn betters with age. This is a placement where lessons will be fulfilled later in life.)
But that said, I can't help but think that developing some mastery over one's
own psyche - becoming a master of the seething, often unconscious psychic forces that most people live their lives reacting to rather than understanding, predicting and even controlling - has everything to do with this placement as well. If there's a candidate for one place in the series of houses that signifies the unconscious mind it has to be the IC. The Sabian symbols for my nodes suggests something of that for me, and I invite you to check out your own Sabian symbols and see if ruminating on them rings any bells for you.
(You can find Dane Rudhyar's take on Sabian symbols here:
http://www.mindfire.ca/An Astrological Mandala/An Astrological Mandala - Contents.htm)
But of course, a lot of this may be coming from my own expense with recently thinks about this exact same nodal placement. Again, I think of the natal chart as essentially a mandala for you to stare at and, in the rumination, reveal things about your self to yourself. What really matters for you is the chart you choose to read, and what you see signified in it...
in 4th House. 
in 10th House.
). Yet there may be a necessity to have to take care that emotion through feeling(Scorpio I.C.+ Mars quincunx Pluto+ SN Cancer) does not continue to take precedence OR is withheld, whereby 'home' becomes a (lonely) place without issue to carry on the family name or genes. 