Hand 1) That was a pretty heavy shove without a read on how they reacted to the flop. OOP I would've checked to see what CO would do. Then on the turn, the K lands and now you're looking to get out pretty easily as many hands beat you.

Hand 2) You didn't play this horribly. He showed a lot of strength as he doesn't seem to raise PF a lot according to his stats, although his AF says he does bluff. I guess it would depend on whether you had any read on him or not. To be safe, that is a clear fold.

Hand 3) This one I'm not too sure. I would've done the same except I would've folded on the turn. That flop is not definitely 88 friendly.

(I would go more in-depth, but I'm at work and I don't have time)

Welcome and good luck dude. I'll be following your OP.