When I had my burms in the past, I attempted to breed and had to get rid of them smack dab in the middle of the season. I did lots of research and came to the conclusion that the baro. pressure on rainy days had a big impact on them. You could try pairing on a rainy day. Also try feeding her a big meal and introducing the male the following day or so. Are you cooling them? Another good suggestion would be to call Bob Clark, he is a great guy and will most likely help you with any info you need.