1. He's supertight + a 25nl player = push pre. They'll call with a lot of PPs and this villain probably has QQ or KK, which he will call.

2. Keep betting! Too drawy of a board plus lower sets will shove. You mention Sauce's guide, and if you read it then you'll see him write that it's only good to slowplay a set on a completely non-drawy board.

3. Shove now. Screw 888 if that's what he has. You beat too many hands here and his c/r makes me believe he has very little FE.

4. Preflop is iffy unless you have a read (which you do not). You are OOP and after the flop you hit two pair. He could have a full house, quads or a lower two pair obv., so I would run the same lines flop and turn, but b/f the turn.

5. Call as others have explained why

6. B/f is better than c/c in general but I think the turn is just a c/f. I don't think he has a flush draw because you have the Ac. I think you are too far behind and have to give up.

7. check turn and f/check river.