1st hand, it's a mistake to think it matters if your straight comes up after you folded. You probably made the right move post flop to fold, it sounds like. Also, depending on what kind of game you are playing, limping with KJo in EP is not necessarilly a bad play preflop. All depends on the players you are playing. At lower limits you can often get away with it. At higher limits you're going to get raised before it gets around to the blinds, at which point you could have a problem on your hands.

2nd hand sounds all around fine. I think the PFR is fine. It sends the message you want to send. Someone with A2s hit is second 2 on the turn and got excited. If he's holding pocket 2s then there's not much you can do. You cant seriously lay down the nut FH.

Edit: One more thing, I think you bet the flop and turn correctly on the 2nd one. You can't let someone who may be holding and overpair like JJ draw you out. Raise, reraise, do what you must to get their chips in because youve got a monster.