Hero QQJ3s BTN(400 Stack) Table covers hero, my image is VERY TIGHT

Midpos Raises to 20
Hero Calls
Sb(loose station) calls
Straddle Calls LAGGY who likes to bloat pots with something, he wont be empty.

Flop J75r (80 pot)

3 Villians X hero bets 60. Dry board, I have pos and my image is tight therefore I bet.
All 3 Villians Calls

Turn 7(320 pot)

brings a flushdraw aswell. All 3 villians X again hero bets pot and is all in. Well I exclude any sets on that flop since that would have bet out or x/r. I also doubt they have Any J7xx either since that would probably do the same. Me having J blocker lessens this to. My image is nitty as crap and betting 2 streets into 3 opponents MUST be strong even for the loose villians. I dont like any rivers since straights,flushesh and overs just beats me... I rep J7xx or JJxx. I hope they will find a fold with 7xxx and maybe even a 55/75. I know you should not aim for getting people off the top of their range but I really think my line looks very strong?

Anyway sb sighs takes some time, says something in the line off ''this is the tighest guy at the table'' at calls off with 7599. The others fold. Is this is a bad bluff based on the fact that one off them was a station or did I just got unlucky HE had a good hand. Perhaps 7xxx he folds? Anyway bad bluff or just a cooler?