just for some peace of mind: older snakes take longer to adjust to a new setting; your other snake is younger and youngin's can adjust very quickly. your situation is 100% normal and almost expected.
you're doing fine. patience.
He has pooped twice in the 5 weeks I have had him and still looks healthy. 585g when I weighed him last week. I live in south Texas and things have warmed up outside a lot going from 20 something to 70 something this weekend. Hope it is just a seasonal thing.