Im checking that first flop. If somebody is putting that much in PF and has an ace in their hand they are not folding it and a set isnt folding, so no better hands are folding here. Also, there arent really any draws on this board, if we are ahead our villain is drawing near dead so we dont need to worry about protection. Given the preflop action the only hands folding are worse hands and almost no worse hands are calling, and we cant expect them to without a read, so we cant bet for value. So with no reads Im probably check/calling and folding to any turn action, if he checks behind Im leading the turn.

Hand 2 seems fine.

Hand 3 seems ok, it could be KK+, but it could also be AK cbetting or a weaker PP that made an overpair with the low flop. Raising to $50 wouldnt make much sense because if called you are likely behind and any bet is going to be tiny on the flop in relation to the pot.

EDIT: Just realized I didnt see hand 2.