Interesting little quandary you got yourself into here, M. His tanking + tilting leads me to believe he has a wide flatting range. You've included SCs and broadways in his calling range which he very well may have. I've also noticed that tilted players at 25NL like to setmine (for some crazy reason) in spots like this where they REALLY shouldn't be setmining. They're tilting and hoping to get lucky.

Given a range of a lot of SCs, broadways, and perhaps underpairs, I like a small bet looking to induce a shove. I personally feel that a $4-$5 bet would do the trick. He may see it as a cheap bluff and choose to shove gutshots, overcards, and pocket pairs (thinking you may have overcards here).