Glad you were able to get something into him.
From what I've heard: Typically once a snake gets something down, it'll trigger a feed response the next time you try letting it feed on its own.
So my guess would be for the next feeding try giving him a pinkie or partial pinkie(however you see fit to feed him, in tank, brown bag, etc) and see if he takes it on his own. If not, I'd assist feed him then as well. He may need a little more in his belly to really trigger his feed response.
Disclaimer: I have no experience with assist feeding and I'm going by what I've read and suggesting what I would do in this situation. If someone else actually knows better, please speak up.