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Just me, and I have yet to have any breeding experience, but...
I would think that the melanizer would be the harder of the two to breed out. Just because it is more dominant. Breeding one with less melanizer to one with more, MAY give you at least some corrects.
As for the tail, I would much rather deal with a squirrel tail than with the white. Seems the white can keep popping up if perpetuated. Breed a high tail/short back to a longer backed female, and you MAY have a fix. JMHO!