I'm glad to see some enthusiasm for the concept. It seemed like a fairly exciting idea (even necessary in some respects) but it's diffecult to get a sense for what others will think about it until you put the thought out there. Anyway, yes, I'm familiar with the fundamentals of astrology, and specifically synastry as well. My method actually uses Mars and Venus as the guiding principles, albeit not exzctly in the fashion you've suggested. After referencing those two planets' positions, I check them against a series of ephemerides for compatible placements of Mars and Venus for a 'dummy chart' and then run any dummy charts collected in that way through a compatibility calculator, eventually settling with one or two options of the greatest compatibility index. I may have over-explained, but it's not too terribly diffecult.