Parallels and Contra-Parallels in Declination
You might want to consider determining parallels and contra-parallels between planets in synastry. I generally do consider them, although I don't always use them if I am doing a quick analysis. If you want to know how to determine parallels and contra-parallels in declination, click here.
Parallels are likened to conjunctions, and contra-parallels to oppositions. When planets form an aspect to one another in synastry and are also parallel to each other, the parallel acts to reinforce that aspect.
I read parallels in synastry as easy, natural, and spontaneous connections between the two energies represented by the planets involved. The interplay is easier than the conjunction, and the affinity is spontaneous. I have also found that Saturn parallels to personal planets are a little easier than the conjunctions in synastry. The Saturn person is not as inclined to criticism or control as is often the case when it is an interaspect in synastry. The stabilizing influence of Saturn is more prominent. When the planets involved are yin and yang (such as Sun with Moon, Moon with Mars, Venus with Mars, etc.), we have some wonderful connections.