The first comment is snakes are all individuals some do well in large enclosures some not so well. It could be stress of moving or just getting used to things or just not interested. It also could be the new enclosure is too big for this snake. Hard to say for sure. I'd try adding some cover plants or something over head and try to bump the hot side temp a touch to 90 under the hide. And leave him be for 2 weeks then try again. Just spot clean and fresh water and that is it give him a chance to adjust.