I PSB this flop and it was a mistake?

[RiverFenix]

Just happened like 15 min ago, but I'm on a different comp so its from memory.
MP villian is 65/16/2.5
CO villian is 70/40/6 - we have a history an orbit prior where he fired small/mid on flop/turn and i called with flushdraw and he checked river and I bluffed and took down pot.

$100NL, I have 145, MP has 75, CO has 185.
I am UTG with AQo raise to $4, MP calls, CO raises to $7, 3folds, I raise to $21, both call.

Flop: A Q 5 r
I lead for ~55, both fold.

I like the rereraise pf and not that im sad about taking down this pot, but I think I gave up a lot of ev by betting.