AKs hand = NO NO NO
It is ok to fold AK unimproved post flop. You have no folding equity in this hand and very little to draw to with a bluff.

UTG has already limped/called a raise and re-raise, he has a hand he's in love with. That flop texture won't scare him at all.

I think you did right on the flop by not betting because mid pairs call these flops all the time to float the turn. I think check/calling the flop is a leak.

Turn CR? well that's just crayness 1/2 stacked or full stacked.