Tough.
I also don't see too much better combos reaching this river.
There is a lot of busted floats and slowplayed sets? Improved QJs?

I think newschool 2019 your betting frequency OOP RFI vs IP CC not BvB should be like maxxxxx 20%. this hand would make it in there sometimes, im not sure if u are using a mixed strat =p I usually think its best to check everything in these spots because often IP stabs a bit too often and you can just take it from there. Betting however is certainly +EV if not too often, but against someone that flats like 20%> betting is likely the best option

Turn can go either way i think checking ur specific combo is good since u block a A high FD ud like him to call with

River I think ill call and pray for a 65s 76s or the same hand, but someone can convince me can exploitatively find a fold

Probably just fold river, sizing is really strong and it's hard for villain to have a bluff. Maybe he could have AQ but that would be kind of weird because he could easily pick a smaller size with that hand.

bet fold river

I think the main benefit of betting this flop with AQ is that we can indeed get 3 streets of value. And on this runout I would try to do exactly that. Then on the river I would choose a reasonable cautious size like 66% and most likely just fold to a raise.

As played it looks so much like QJ but given your bigger flop sizing would probably make him fold most T9 and I wouldn't give him 100% of his 44 and 33 combos I think I'd still call with AQ. For instance I'd assume a board like Q86 would increase his set density. Maybe Q9 or QT makes a better call due to blockers but this is only true when he continues with T9 + bdfd on the flop and also I wouldn't bet Q9 and QT on the flop so AQ and possibly KQ might be few of the only Qx combos we have?

You can sometimes observe crazy stuff when cbetting a flop and slowing down afterwards. People at NL10 can show up here with some random stuff and there is still busted flush draws. As KatonBond argued maybe folding AQ with the Ah and calling otherwise could make sense.

I think it's questionable I somehow merged the tendencies of disciplined regulars folding 44 and 33 and the tendencies of recreational players showing up with random bluffs.

Turn can be bet at least some of the time. I like checking most with this combo since there is bad removal from his calling range on the flop(assuming he is not on a pure float). You block A4hh A3hh, A2hh, A5hh, AJhh, etc with this combo. These are certainly some of the most likely hands to bet turn when his equity drastically improves on the 8h.

Fold river. He can have a bunch of value and the only bluffs he has are missed straight draws unless he is turning a weak SD value hand into a bluff.

Bet flop, bet turn, bet river small, fold to a raise on turn/river is how i'm playing this. As played i'm probably folding river.