I have dipped and crested my FMJs, and fletched them with blazers. What I don't get is why they "seemed" to be flying great before, but now are noticably jacked up.
IMO, the dip and crest added enough weight to screw up your FOC. You're probably under 8% with tips that light, and I think you're seeing more of a lack of stability than spine problems. You've backed off the draw weight from 64# to 60#. That should be enough to try something. Stick some 100 gn points on 'em and see if getting your FOC back over 9% will straighten out your arrow flight.
Also, how were your arrows fletched before?
If those are the only two things that have changed about your setup, and everything was fine before you made those changes, then those are the only two things that really need to be examined.