Hand 1: You can essentially shove the river with anything here and feel good about it. I'd just check river with AJ though.

Hand 2: This is okay, the thing is there's no doubt he's going to raise the flop with a balance range, so this is tough without some other read. If you've been leading a lot of flops with air against this guy this sort of move is can be necessary. Personally I like either c/c or c/r here since he's unlikely to threebet are flop c/r and we can pick up A or Q or heart on turn.

Hand 3: I'd probably check turn but as played fold.