Hmm.. I haven't had a problem feeder BP yet and feed f/t to all of mine. That said, how do you thaw yours out? I put them in a baggie (ziploc) and float in hot water until fully thawed and the right temp. I've read that doing it this way holds more of the smell in than just dumping them in a bowl of water.

Also, have you tried doing the zombie dance with the rats? I wiggle mine around on long tongs in front of the BPs and this seems to help them be interested, vs. just leaving them in their tubs.

Good luck with your problem feeders... I have a hognose that is the way and I hate to see food wasted and him loosing weight due to not feeding.