Not many preflop reads on opponent but postflop he has been barreling a lot and continuing with a frequency on turns and rivers

Pre flop and turn I think are standard I think especially against someone betting quite wide on the turn when we have good equity against all but the top hands in his range.

First thing I noted on river was his sizing which I think polarises him more than if he had better smaller and means we can potentially rule out lower flushes than ours and potentially even the J high flushes. Dont think we can call here but wondered if anyone thought it was a good spot to bluff. We have a Q which blocks some of his full houses and I am not sure he would bet 55/44/33 on the turn though I cant eliminate all combos. Facing a shove in this spot based on the ranges I assigned he has to be folding A high flushes at least some of the time to make this a profitable spot. Is this too optimistic to give someone credit for in game?