For the OP, are you warming up the frozen-thawed mouse enough. I pulled 2 small rats out last night for mine and placed them in the fridge last night for todays feeding. I will get home and put them in hot tap water while I prep their feeding cage. I have even toyed with the use of hand warmers which I may try tonight. Either way also make sure you are feeding gradually. If they are not eating, then start smaller and work your way up.
metalsmoker I think you need to try F/T WEAN. If you use the 10% body weight thing for now you should be roughly at Wean rats at the highest. You may even want to try a large pup just to get it eating.