No I've seen other breeders breed the mother back to the son. When they are trying to get something out of a morph. However I have not done it myself. If you really want to get your project going. Get you a male piebald like you were saying. And find you a het piebald female and raise them up and breed them together. Then you will produce some Piebalds which have a greater value than normals. You can breed your normals as well, they are not worth a lot. However I always find homes for the ones I have. I really like Piebalds to. I have a male and two 100% het piebald females that I plan to breed in the future. The thing I like about Piebalds is no two of them are alike. And there are so many morphs that you can breed them into and work with. I can't get enough of Piebalds my piebald is my most favorite snake in my collection. By the way your bp's look good,you can tell they don't miss any meals.