Re: Karmic matching
Much depends on WHAT is involved, and yes, the more indications of a karmic tie, the more likely it is. IME, true karmic ties usually have more than one indication, and will probably show them in both synastry AND composite.
Additionally, you can feel "pulled" to someone without it necessarily being karmic.
In terms of karmic ties, the following are especially important:
--Saturn placement and connections
--cardinal point contacts
--some would also argue Neptune placement and connections
But the big two are Saturn and the nodes. Saturn is about debt, and the nodes are specifically about where we've been in past lives and where we need to be going in this one. As Neptune governs the spiritual, that's why it's sometimes included too.
Saturn is important in synastry and composite ANYway, as it shows staying power. Synastry and composite that shows little or no Saturn connection will not usually last for the long haul. Of course, bad Saturn aspects can also kill relationships, or make them singularly unpleasant, so it can be a grab-bag. You gotta HAVE Saturn, but if you have, say, Saturn squaring Venus, or the Moon, or the Sun, or the Asc/Desc ... that's not going to be pleasant or easy to manage in synastry or composite. Saturn opposing is only slightly better -- largely because oppositions *in synastry/composite* can be easier than in natal charts, as this involves two people, not one, and if used well, an opposition is about finding in the Other what we lack in ourselves. Squares are just about friction. But Saturn in opposition isn't much better than in square.
Good Saturn are the easy aspects (sextiles, trines) and *sometimes* the conjunction, depending. Saturn-Jupiter in conjunction is, say, much easier than Saturn-Mars. So everything depends on how well the other planet blends with Saturn.
Saturn makes heavier whatever it touches. That can lead to restriction ("You cramp my style"), or it can lead to magnificent support ("I couldn't manage without you"). That's why you need it in synastry/composite: without the strength and staying pattern Saturn provides, the relationship disintegrates over time.
Saturn is also karmic in that it points to responsibilities we have towards others. Even "negative" aspects still indicate karma.
N.B.: When looking at synastry, I use orbs only about half the size of traditional orbs: so anything outside 4*, unless it involves the lights or cardinal points or a "chain" of conjunctions, is too wide. For composite, I tend to read those charts more like a natal chart, in terms of orb size. Remember that synastry is how you affect each other. Composite is about the relationship you create as a pair, so both need to be considered.
Nodal contact is also karmic, but with the nodes, allow no more than 2* for most planets, maybe 3* for Sun/Moon/cardinal points. I'm also a little more generous with node-node *because* that is THE karmic connection sign, all the more so if it's N.Node and S.Node. I know of one chart where the degree is approaching 4, but because it's a reversed nodal contact, which is somewhat uncommon, I believe it has an effect on the couple in question, although it's not strongly felt.
Last, contact between the cardinal points is important, especially if they're flipped: One person's Asc is near the other's Desc. This works even if they're just in the same sign, but better if there is actual contact. (Obviously, this only affects synastry.) But this also indicates a karmic tie. The same applies if it's Asc/Desc to MC/IC, although it's less powerful. But if one person's Asc is at another's IC, for instance, that brings the first person "home" to the second. Asc to MC is, I think, more about career connections, but can still help in a marriage. Nonetheless, I wouldn't call the KARMA there relational.
Note on the points: one tie I consider almost as karmic as nodes touching in synastry is the Saturn of one at the IC of the other. I don't want to see one person's Saturn on the other's DESC, or in their 7th house. But Saturn on the IC or in the 4th house is a different matter. Saturn in that placement acts as a bedrock. It CAN indicate a "heavy" homelife or excessive demands (one partner may have to care for the other), but not always. If there are enough contacts that suggests great affection/love, and the natal charts of the two people in question suggests they are more serious-minded, then this Saturn placement is helpful.
Again -- and as always -- a LOT depends on how two people are *alone*, as well as together. If you have two individuals whose individual charts suggests much stability and sensibleness, then seeing, say, a Mars-Jupiter square, or Jupiter-Jupiter square in synastry (or the former in composite), is going to be much less of a disaster, might even be useful. But if you've got two people who fly off the handle or are extremely scattered and/or prone to exaggeration individually, seeing a Jupiter square in synastry or composite isn't a good thing!
Anyway, those are some of the key things to look for, in terms of *karmic* ties. As noted, one can feel *drawn* to a person without it necessarily being "karmic."
If you're feeling intense ATTRACTION, look for strong Venus-Mars and Venus-Pluto connections. Especially the latter can feel "compulsive." Pluto to any of the personal planets (esp. lights) can generate strong attraction, but it's especially true when it's Venus. Moon-Pluto is also compulsive, but more about emotions than attraction. Sun-Pluto similar.
If one partner's sun falls in the other partner's 8th house, a similar "pull" can be felt. For instance, a guy I was interested in once had BOTH his sun in my 8th house, AND my sun conjunction his Pluto. Double-whammy. (We also had karmic ties, but the obsessive feel was more about Pluto.)
-- Kenoshamaensa (Kay)