i have a 95d (w/o mcore) and an 89t (w mcore) and i do find microcore makes the top of the hoop a little more responsive and it doesn't feel so bad when you hit a bit higher up the stringbed. that being said, it's a small difference and one that shouldn't really be a deciding factor.
the biggest change for me is the implementation of Xi in the new lines. do you mind playing with a squarer racquet?
anyway. really bummed there isn't anything 90-97sqi.