Although I've never had problems with our balls shedding at 65% humidity (are you sure your hygrometer is accurate?), some do seem to have a little harder time shedding than others. Try adding some damp sphagnum moss to his hides.
I wouldn't worry about him being in his cold hide. He is probably just stressed out right now and doesn't want to leave his hide. Leave him be for a while and he will come out when he feels ready.
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