Villain is playing 25/21 AF 70% and fold to 3bet 100% (4/4). Is there anything I could have done differently in this hand? Now that I'm reviewing it I feel like he wouldn't do that with AQ/KQ, so what is really repping with the raise?

Do you guys think that 4b shoving as a bluff is bad?

Against a high fold to 3bet you can try flatting pre as you're suited and he likely folds the hands you want to keep in.

But it's such a small sample, so it can go either way.

He's repping nothing OTF fwiw, so I might spazz shove.

Do you think that is better than calling?

AA KK most likely 4b pre, AQ, KQ and prob some pp's like JJ, TT, 99, 88 are likely to just call your flop cbet...

That leaves me to AK and QQ. Given positions, Villain might just flat these (IP vs BB 3b). But dunno if villain would raise flop with QQ, could easily be but OTOH this flop is pretty dry so why not let you barrel away with your range (consists of both strong Ax and big pp's) ott instead of folding out the strong Ax of your range otf, which he's doing right now. Could be AK but then again, not too sure about that either.

My best guess is that he's doing this with QQ or AK (maybe AJ/AT as well).

Raising QQ otf would be really bad

Yes.

Why do you think it is better than calling? If he's got nothing on the flop, and you shove, he can't continue. If he raises the flop with nothing he may get all-in with nothing. You'd have to be pretty sure that he's got nothing, but if you're shoving it would be better to stack the villain, no? You can always push him off his nothing on a later street.

Villain could be playing AQ to "protect" his hand. He could also (but less likely) have AA or KK. He may also have been playing a pocket pair that beats 66 or gotten frisky with suited connectors that include a Q or a 6.

Anyway, when someone is playing 25/21 and plays that way UTG preflop (calls the 3bet when he's folded to the last four), I feel like A high may not be good. I'd fold. I'm hoping somebody will be willing to tell me why I'm wrong

You're forgetting a few points. This is a pretty locked down board, and he doesn't rep any valuehands by raising us IN position mind you. But it's possible he's brainfarting with deuces (which we lose to unless we improve) or something stupid like JTs (which has six outs against us). He might even spazzshove 22 ott if we flat and so then we lose to a bluff.

Yeah it's possible he slowplayed something preflop and is trying to level us, but we do have overcards and backdoor flush so our equity isn't total crap most of the time, and like I said I expect a lot of fold equity against such a weird line.

That being said, I certainly won't fault anyone for folding either.

Taking villains line with most hands is pretty bad actually

I agree

Over a small sample I am not so sure though, I would be worried about slowplayed AA, KK judging by his position and his fold 3 bet stat he's going to have a very strong range.

flat pre
as played fold

+1