This may be a little long-winded. I have questions on 3 different snakes and would like confirmation on whether my plan for each of them seems appropriate. All questions are in regard to their feeding. I'll give a little background on each and what I plan on doing.

Female BP (1600 grams) - currently in an AP T8. She's eaten small live rats consistently. Four weeks ago she ate a prekilled small rat left overnight. For the past 3 weeks she's refused F/T rats that were "danced around" and left overnight. I plan on going back and giving her a prekilled this weekend. I will keep doing that for several weeks before trying F/T again.

Male BP (700 grams) - currently in an AP T8 (it's big but he has 3 hides and really utilizes the space at night). He's a very good eater (will even eat in shed). He's eaten live consistently (never missed a live meal). First time giving him a F/T, I left it overnight and he took it. However, the past 2 weeks he's refused, although he did strike at it the last time. Seemed like when he missed, he hit his head and got scared, so didn't strike again. I will continue to try F/T with him since he seems to have potential.

Male Dumerils Boa (4 months old, unknown weight) - acquired him 10/15/16. He's in a 12 qt tub. Recently changed the substrate to coco-husk from aspen. I'm finding he burrows a lot more with the coco, which is better IMO. I was told he was eating F/T mice, but they had to be left overnight. I've tried feeding him 3 times since I've acquired him, with no luck (giving him F/T mouse hoppers). Because of his age and since he's new in my care, I plan on starting over completely and offering a live mouse pup or hopper. What's the largest sized mouse I can safely leave overnight?

The T8 temperatures are regulated with RHPs. The tub has flexwatt set to 86°F and a CHE to raise the ambient air around the tub to around 75°F.

Any reason to alter this plan?