1. They've been bred before, so my first thought is: how old are they? I don't know how they compare to betta splendens, but betta splendens reach their breeding peak at between 3 - 6 months of age.
2. From your previous posts, it seems like you haven't had much success breeding regular bettas. From what I hear, wilds are generally harder to breed.
3. Having bred and raised a few betta spawns myself, I couldn't imagine how hard it'd be to breed bettas in a bucket. You need to be able to see underneath the bubblenest. Also, moving fry at an early age can be stressful. Your best bet is raise the fry in the same tank that they were bred in.