Not that i am looking into breeding yet but when you say lots of calcium how much do you mean?should the feeders look like ghost or just the same amount on the feeder with more of them getting dusted?
Only two things i can think of right now that would be dehydrated and it sounds like your taking care of that with showers and as far as the scrapes go maybe got weak enough from the dehydration to fall of a branch or whatever it was climbing.Or a cat got a hold of it which wouldnt really...