Humidity needs to be bumped up into the high 70-80% range during shed time.
Lights will dry the air in the tank out and ruin your humidity, you don't need them unless your ambient air temps are super low.
There is a DIY sticky for tank top lids that will help keep in humidity and heat.
You can give him a steam bath in a couple inches of water in a closed container. The water should be warm, in the mid to low 80's. Leave him in their for about 10-15 minutes and he should be good.