I guess I shouldn't be surprised, but your experiences with these fish are identical to mine. I can handle mine all day, and the next day they're eating. The one thing I've noticed is that if you take an age-2 CSBG that's been outdoors all summer and move him into an indoor containment, they take several days to go back on the feed. This seems to be primarily for fish 8 inches and over.
I get that a lot with fish I move into cages that have never been in a cage before.