[warrantofice]

i don't think your have enough chips to even make a flop bet. its push or fold time here. And i think it correct to push. Although, very odd that someone with the chip lead is flat calling the short stack...Smells like a trap. But with the previous information of him doing this repetitively well...I;m leaning towards a push. If he was slow playing you with AA or something like that your not in terrible terrible shaoe you got the gut shot + 2x 4's + 3x 7's so its not the end of the world.
I'm thinking - with no math mind you - that a push here is pos +ev if you can win the pot outright 35% of the time. So i think you did it. If you flopped a monster then i might bet a resonable amount but it is fishy.

unless...you've played with him alot and had some read that he'd 5th level think your small raise was actually a monster hand and you had a great chance of him folding plus giving you odds to call with your gut shot/two pair draw