PFR here is a waste of time, like the good man W.Deranged said, this is a multiway pot with a hand that dont work great in multiway situations. We dont have the equity edge we need to make raising preflop correct.

Flop bet is not profitable here , much better to check it through. Yes, betting might buy us some outs and fold Ax and MAYBE some small PP's that missed but definately not enough to be profitable. On top of that we got 2 to a flush out there and are most likely behind.

Bet the turn obviously.

River is very player dependent, the standard line against a monkey (from your description thats what he seems to be) I see this as a pretty clear bet/call a raise.

Just to return to the title of your post: not the right place for a flop stab, too many people, plus the flush draw and no real fold equity.