These are homozygous pied and heterozygous mojave so when bred to a normal all the babies will be het pied but each will have a 50% chance of also being mojave.

Care to post any pictures of the mojave het pied father? If mojave makes the homozygous pied more white I'm wondering if it has an effect on the heterozygous pied. Of course the mojave belly is already white so maybe it's harder to pick a mojave het pied than even a normal het pied.