I prefer 3-betting this pre. If he's folding 78% to 3-bets would it not be better to add more bluffs whilst still 3-betting your premiums. Instead of flatting strong hands because you don't want him to fold pre.

Regarding the turn, i'm kind of lost if you call here your going to have to be willing to call most rivers if you think he is bluffing. There are a few draws out there although you block the Ax of spades. You could raise all-in, he might call off with his big draws and some worst Ax (AT AJ). Obviously calling all his sets and 2pairs as well. You should stove a calling range if you jam and see how much equity you have, another benefit is you aren't playing a guessing game on the river if he bombs it.