Villain is playing 25/ 21/ 5.5% 3 bet

Of the 5 hands he has faced a 3 bet he has folded 3 times and 4 bet the other two. Seems to defend to 3 bets with a 4 bet or fold albeit small sample size(150 hands).

I feel this makes AA a good candidate to peel PF esp considering depth of stack.

I think on the flop that if I cr he will simply fold out worse hands and continue with better hands considering the stack depth I don't think this is an option.

OTT i'm really not sure I feel like a chunk of villains range c backs here. Bluffs feel like suited combos without spades that don't block JJQQ(109/ 78/ 56 etc. My real concern is a large majority of villains range with a spade c back. Many hands would just shutdown on the turn. Even hands like KQ with a spade I would think c back turn.

Another part that threw me was the sizing OTT should we generally be betting two thirds pot with a flush on the turn here. Also should sets be betting the turn against our range here?

Was this a huge donk off to get it in on the turn? thoughts on all stages of the hand please. Thanks