Still not eating and VERY active

[Marduk]

Granted, I'm newer to this with bp's but since he's taken pre-killed before without an issue and yet is refusing f/t, I would wonder if this is a prey temperature issue.

Make sure you're heating the mice enough. A mouse's body temp is 98 degrees F.

Yeah, I've been trying to do that as well. I've been warming them to temp sitting in hot water (from the faucet) and/or under a CHE. I use an IR gun to get the temp up to 100 degrees and warm to touch.

Try rats, a bp that size should be on rats anyway. Your temps sound fine, and the extra activity im sure is from hunger.
Have you tried braining the mice? That might do the trick.

I tried frozen rat pups in the past and he didn't go for it. I went back to mice since I figured that would be easier, and it'd be only changing one thing at a time. My intention always was to go to rats; instead, he's been eating 2 mice per feeding to reach 10-15% body weight. Overall, he seems like a pretty picky eater, but I only have one BP and no basis for comparison.

Is braining the mice splitting their heads open? If so, no, I haven't done that yet. What's the typical method for doing this?