[sapsuckah]

First of all, your converter messed up the pre-flop action... BB minraises first to act... and observer folds?!?

In general, I'm much more likely to slow-play a set on a two-suited flop when I'm up against only one opponent. One opponent is very unlikely to have the flush draw there and I'd rather concern myself with extracting chips than worrying about the draw. Vs the villain you described, I'd probably check and let him take a stab at the pot if we were HU.

Once there are two or more others in the pot, the chance of someone being on a flush draw is much higher and I'll almost never slow-play.

In your hand, I'd bet out on the flop. As played, raise more on the turn.