15/30 is out of my league, but I'm not sure what the point of the flop bet is. You've got 6 clean outs, but even then you're subject to redraws. I'd rather check figuring someone will bet it for me, and if it's check around, that's not a huge loss since you're on a draw anyway.

The river seems close on check raising vs trying to bet with the intention of 3-betting a raise.