Your temps are good, no need to do anything about it, how are you managing to maintain them without anything heating the enclosure itself? If you haven't done that already, you should cover 3 sides of your critter keeper with something, put a plant of some sorts to create a hide that he can hide under. Everything seems to be good, don't worry about dusting now, get exactly same size of crickets they used in a store before and throw some in a tank about half an hour after lights are off and temps down, see what will happen, if nothing then repeat same tomorrow without touching anything at all except changing water. Try not to move the keeper while doing so. Don't tong feed him just yet , let him adjust and eat what he is used to, and when you are confident he eats/poops then start tong training.
I'm sure he'll come around and please keep us posted![]()