Snakes don't understand why or how the "world as they knew it" just disappeared when they're moved into an upgraded enclosure- obviously this doesn't happen naturally in the wild, & they're instinctively unsettled by the changes- more so when they're mature, as opposed to young snakes. He sounds somewhat stressed to me- & also he may be reacting to the lack of UTH heat now- even though you're sure he's warm enough, snakes are feeling "belly heat" differently than overhead warmth.
I know how eager you are to have him eat- but assuming he's healthy & has proper weight, I'd try not to worry for a while, & only offer food every 2 weeks or longer- that may help. Our snakes sure can test our patience sometimes- hang in there.
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