Two big plays - Bluff and big laydown

Recently I played in a cash game, stakes was 5/5. A few players limped ahead of me and I was on the button with J5 suited and decided to make a play at it, I raised 8x to 40. (yes again our standard game open is like 6x or more, with limpers ahead I had to make it 8x) A few callers making the pot like close to 200.

Flop came:

 Aggro player loves to steal big pots donk bets 140. Super tight rock limps behind. Action on me on the button. I had nothing. No flush draw, only a runner runner straight draw. Normally I would have given up on the hand but I felt that both players were weak. Aggro player can have anything, maybe a draw. I doubt I can push him off a flush draw, but JT or QT likely he might fold to a big raise. But mostly because the rock limped behind him. He has gotta be wary of that. But what can the rock hand? A king? Set or top two is in his range but he probably reraised the 140 by then. Ace king doesn't seem likely, so maybe a King with a redraw, possibly J clubs. I know in this situation I might be called down by a flush draw when even if they miss they might still be good. But somehow I had a read on this hand that they will fold to a raise to 415.

Aggro player tanks and folds, kept on eyeing the rock behind him. The rock also folds his weak King and giving me the pot of about 100 bbs.

Last night I was playing the same game when I had AKo on the straddle. 4 limpers and came back to me. I made it 10bb. (they limped 2bbs each). All 4 limpers called. Pot was 200. Flop came:

 My AK looks in really good shape. I bet 140 into 200. Player on my left just calls, then the next guy tanked for a while then called. Throughout this whole time I studied them very hard. Something tells me it isn't right. Guy on my left looked really strong. His demeanour, breathing, everything. Turn came another deuce.

 Ace king should still be good here if it were good on the flop. But I studied the players again and something felt off. Pot was 620. I had 290 left. It was a shove situation I feel. But something felt wrong so I just checked. Guy on my left bets 245. The other guy calls. I don't put them on the deuce. Maybe to some my AK is an easy fold, but they fold because the read the caller not the bettor. I felt the bettor was the stronger. Anyway I fold and it went to showdown and guy on my left showed AJ. The other guy mucked.