ok, you need to replace your thermometers with the one I pictured above.

Thin out the substrate the layer a little so it is about 1/2" thick for best results.

most people on this site, and all of the big breeders feed their BP's in their cage all of the time with no negative effects. I'm not saying that you will never get bit, even around feeding time... but it won't be because he thinks that you are dinner.