What I do is let my fuzzy thaw at room temperature in a closed zip lock bag for like 30 mins,then I take a heat lap and I place the mouse about 6 inches aways from the basking light and let the thing fully thaw and get soft and nice and warm to very warm..dangle him in the tank and Kocur snatches him up within 3 seconds
hope this helps and good luck,I hope your little guy starts feeding
as for the whole humidity thing,I'd say my humidity averages 55-65/70 and the warm side Avgs 84-90. My dude eats like a beast. For humidity help I keep a large damp rag on top the screen. In the morning before I leave for work and again as soon as I walk in the door,as well as I mist the tank 2 times a day.