Re: Synastry vs Draconic?
I associate draconic charts more with soul level and aspects found in draconic can manifest in very developed inividuals, more often in practice synastry is the most obviously manifested, also composite and Davison charts. While draconic tells much about the nature of attachment of two souls involved, it is not practical in analysis of most relationships.
I've seen some very strong draconic attachments that failed because of bad synastry. These souls perhaps weren't ready for a relationship in this lifetime, and possibly will reconect in some other life. For this life, looks for individual charts first, then synastry, than composite/davison, as those will most likely be enough.
Regarding Mercury squares, those are difficult in synastry charts, so look if there are also good aspects to Mercury of each of two persons that would make these squares easier.
Venus squares are not that bad, as I understand.