If I get you right, you want to use a stack of this "Astrological Affinity" to eliminate a CD or rather not trigger one, in order to consume one (or more stacks), right?

I mean, I see where you are coming from, yet I doubt it would be that viable. Sure on ED it might be nice, but what's it good for at Collective Unconscious? In addition even if it would reduce the CD of Synastry I highly doubt that you can have two Synastry effects up at any one given time.

Don't get me wrong I highly recommend you for posting your thoughts and ideas, and especially for taking the time to create these, but.. I don't know..^^

Let's take synastry for example a much better buff to it (probably overkill, so it won't happen) would be to remove the duration of the spell (ppl might condemn me for the following, but: the same mechanic can be found in WoW, called Beacon of Light). Yet IF SqEx would change it that way they'd probably need to nurf it so the healing is not 50%, but rather <25%.

so far