I'd have raised it to $1.75 PF (4x + 1 for each limper). You need to make those later position limpers pay to play.

I'd have bet 3/4 the pot, if not full pot because you are out of position on a fairly coordinated two-tone board with 4 other players.

I think you needed to play this hand a little hard to make up for your lack of position. It's better to take a smaller pot than to lose the big one.

The three really doesn't scare you at all, so bet the pot again on the turn... and voila, you are committed on the river if you still have someone chasing down with you.