Disclaimer: I worked my way through undergrad and grad school as a vet tech, including exotics practices, but that was a long time ago. Still, these things in combination worry me: staying on the warm side; noticeable weight loss; the fact that the snake just seems 'off' and listless to you.
Given all of those things in addition to the feeding strike, I'd get him to your exotics vet and see if there's an underlying illness affecting him. I'm not trying to be overly negative and I really hope it's just a classic BP-style hunger strike, but a few things you mentioned sparked some extra concern in my mind.
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