In hand #2, if you aren't sure you want to play that flop for stacks, then don't check/bomb for nearly 50%BI. As played, call/fold is pretty much borderline decision and it's shitty spot to be in.

Against TAggro player you can 3bet pf, then you have much easier decision (LoL fold) if he re-re-pops it, against nit set-farm, maybe try to show it down when he can't sell his good hands. If you want to play past flop without a set, then it'd be necessary to know something about villain's range and his postflop lines.