Depending on the size of the mice, three may be a bit excessive. Have you tried switching him to rats? If you're having to feed multiple mice you should probably try to switch over to appropriately sized rats.. One rat per week will also likely be cheaper than three mice per week.One feeding per week is fine though, as long as you're feeding the correct size prey.
As for the "female", she may just be a picky eater.. It's a bummer, but it happens. It's not uncommon for them to refuse feed through breeding season (winter months). As long as the temperatures and humidity are up to par, there's not a whole lot you can do other than trying different prey. Try appropriately sized ASFs with her.. some BPs prefer those to mice and rats. Now the stuck shed, your humidity was not as high as it should be, most likely. Once you see them go into shed (cloudy eyes/pink belly) bump up the humidity closer to 70%. All other times it should be between 50-60% and you should have no problem with stuck shed. Keep an eye on her weight and if you can't get her feeding and she keeps losing weight, take her to a knowledgeable exotic vet. Feed refusal and weight loss can be a sign of an unhealthy BP. Also, focus on temperature and be sure whatever you're reading it with is accurate. A cold BP will not eat because they will not be capable of properly digesting their prey.