I would've done the same. The really low straightdraw is probably not much of a risk considering how many people called your PF raise. The flushdraw would've made me nervous though.
If I bet as a bluff, I should be thinking "am I getting better hands to fold? Is it likely that he will fold x% of the time to a y sized bet to make it +EV?". If I bet for value, I should be thinking "am I getting worst hands to call? Am I ahead of enough of his range that this is a good value bet?".