I'd raise the flop harder. I'm a big fan of keeping c-bets consistant and 2/3 is what I usually go for, but here I think you need to get out the big guns and go pot or higher. Too many draws, too many opponents and AA can be hard to dump later (for me anyway).

As played, Sprob has only got about the size of the pot on the turn, I'd be getting him all in there. As its fairly clear, given the size of the pot, you won't fold for another 14 on the river, he's getting solid impied odds to chase and saves money when he misses (assuming he is on a draw).