Yeah A8 not good hand to flat 3-bet with. I 4-bet or fold pre.
Postflop, minraise is super-spewy, but you said you know that.
He's probably not folding 99+ here now that the pot's big and nothing worse pays off another bet. Pretty dry board so I guess I check behind and check or fold any river. Being in position helps a ton here as his 89-type hands will probably just check back and I don't even see overs bluffing
here because your line just screams trying to trap him. Hell I wouldn't be surprised to see him check a boat back on the river to check-raise. You're beat the heavy majority here though, so I don't think betting to deny the 6-outer from AJ+/KQ/other random overs really justifies the amount of times we'd put money in behind, especially given the fact that we don't pay these 6-outers when they hit and oop they can rarely bluff us unless they hit.