Hello,
I'm a fairly amateur astrologer myself. I wanted to answer, though, because I have been working on a very similar problem in my own chart, and have found something that has really worked for me.
As noted above, I also re-ran the chart so I could get a better look at it, and didn't see a T-square based on their calculations. But I do have an idea for you to play with.
I have a T-square with Mars as the troublemaker. However, mine is in the 11th house. I stumbled upon something in looking at what's not working in my life, and it was massive. Seriously once the light bulb went off, my life is turning 180 at a high rate of speed in a great way.
My least aspected planet is Venus. Mars, as obnoxious as it is in my chart, is not even the most aspected planet.
The concept here is, think of it as a dinner party, and you're looking down from the chandelier. The most aspected planet is the one taking up all the oxygen, dominating the conversation. The least aspected planet is the one getting the least participation. The obvious thing to do seems to be to practice letting the quiet one speak.
I was mulling that over when I saw a suggestion on growing through a T-square. Namely, think of it as a three-legged table -- wobbly and unbalanced. See where you'd need a fourth leg for perfect stability. In your case, that would be the 11th house.
Your least aspected planets appear to be the Sun and Moon, and your most I would have to say is tied with Mercury and Venus. Your Mars is close to least aspected, actually.
My intuitive hit about what's going on with your chart is to first, imagine you have Mars in the 11th house *as well as* where he really is. In my case, because I have a least aspected Venus, I placed a "mirror" of her across from him, in the 5th house, to balance out the T-square, put the fourth leg (the one who can't get a word in edgewise).
In a proper T-square, you have an opposition (I have two) with one planet trying to disrupt the tense dynamic (making the T). I intuited it in my chart as four dinner guests coming to blows, while Mars stands there shouting at all of them to calm down. So I imagined putting a mirror in my 5th house, so Mars could catch a glimpse of the charming Venus, get distracted sit down, and shut up. Totally worked.
Now, your Venus is hyperactive, and you're not in a proper T-square You have six guests throwing punches at each other, sitting almost evenly spaced around the table. No rest for the wicked!
So in terms of balancing out what you're thinking of as a square, look at the empty real estate directly across from your 5th house, in the 11th. Since Mars is comfortable in Aries, and he's one of the least active participants in this dinner party where Venus is talking non-stop, try shifting your Mars to your 11th house, and see how he would operate differently than he does in his comfort zone in Aries.
Practice acting and thinking as though your Mars were that other one. I even picked a Kozminsky symbol that suited me for my purposes, and imagined planting my Venus mirror on the precise angle that I wanted to manifest. Here's a link to the Kozminsky symbols, if you're curious.
So my idea is to pick 6 Virgo, directly across from your Mars. Here's your Kozminsky symbol:
6º Virgo: A large ballroom in which men and women are dancing.
Denotes one of light and free mind who allows nothing to oppress him. He meets with favors and enjoys gifts. He loves the beautiful in form and color. Scents and perfumes fascinate him. It is a symbol of Elegance.
So what if your Mars were in the 11th house, a light and free-minded ballroom dancer who allows nothing to oppress him, in an 11th house sort of way? What would that elegance bring to your life? Note that he's fascinated by "scents and perfumes" here, in other words, being engaged by Venus, the star of your show. Sounds like a winner for me.
If that doesn't yield you the kind of results you're looking for, I'm actually more interested in your oppositions. Sun v. Moon as least aspected planets, that's screaming for your attention IMHO. Interesting that you're asking about Mars, and your Most Aspected is Venus -- there's a rhythm there that is mirrored by your Sun and Moon, I would almost call that at an octave. That's really what I would work on here, reconciling this opposition first.
You also have an opposition that we share -- Neptune and Jupiter. I had an intuitive experience of that as forming a "torus" in my psyche. The best way to understand that is to visualize a torus, hard to explain if you've never heard the word, but once you see a picture of it you'll totally get it.
The thing is, Neptune is the deepest depth, and Jupiter the outermost reaches. So to have them lined up right across from each other in your chart in this way creates a sort of doorway to other dimensions. You can get to a higher perspective from there.
One site I have found massively valuable in looking at my aspects is this one:
http://depthastrology2.com/Planets_In_Aspect.html
Hope that helps. Thanks for sharing your interesting chart!