[Walker]

Hand 1: Unless villan is a serious donk he has at least An ace with a big kicker. Getting almost 8-1 it's a close decision between folding and calling. If we do call, I'm folding the river UI.

Hand 2: Why not bet the flop and see how your opponents react? I think your hand is wayy to vulnerable to risk having the flop checked through. The way you played it, assuming your planning on calling his river bet, I think you should bet/fold the river (unless he's really crazy in which case you should check to induce a bluff). I expect a loose player to call here with any pair, and maybe even overcards. Checking allows him to take a free showdown with those hands and bet hands that beat yours.

Hand3: raise pf! The way you played it, I think I like the flop call. You don't want to knock out the SB, and getting a raise in on fourth street is almost a certainty.

Edit: I forgot that this is party .5/1. 3 bet flop in #3