Hand 1: Fine, although just calling is maybe better. You'll have to make sure all of his money gets in the pot. Giving an A/K to AK makes that more likely.

Hand 2: Usually fold preflop, drawing hand OOP HU sucks. Calling flop is fine, I like c/r better though. Bet turn!

Hand 3: Raise pf more (depends on table, but getting 4 callers is ridiculous), bet flop, bet half pot turn, just call river.

To summarize: Turn up the aggression!