hand 1:
bet more pre, especially OOP. standard for me is 4bb+1 for every limper but i'm popping this one up to .35 or .4 because OOP is way harder and winning the pot preflop is more valuable. i bet more on the flop because its a wet board and we get value villains Ax's. i probably bet 0.7. given villain is pretty nitty i probably check (as you did) the turn for pot control because if the draw completes on the river we can bet/fold easily. as played i'm not folding for 0.75 because it's cheap and he may be trying to take it down with his A7-AQ after you checked. river lead is fine imo. river call is terrible.

hand 2 is bad for the reasons you explained. in an ideal world i fold to the flop 3b because we are drawing near dead to his range, but i probably spewcall on the flop and fold to his inevitable turn bet.

hand 3 i probably don't even "test the water". the only hands i want to fold which they could have are AT-AK and your SPR v BB is allowing him to play his hand perfectly.

i know you know that these are bad plays and why. if i have any worthwhile advice whatsoever it would be taking as much time as you feel you need to decide what the best play is, and erring on the side of caution if you cannot figure out villain's ranges/equity/fold equity in "the heat of the moment". i find some helpful thoughts to use when i get lost in a hand and the timebank is low are:
"is villain doing this with much better/worse?"
"how likely is villain likely to be bluffing/expect me to fold on this board?"

good luck and i hope i helped