Eh I kinda think Black Pastave would suggest a Black Pastel Pastave.
Black Mojave would seem to fit better.
Its so annoying that we call them Black Pastels when they really should have been named something else, as the arent in the Pastel complex, they dont produce a super that is anything like a super pastel, etc.
Like we could call them Het MelanisticsAnd the supers should be called Melanistics. Melanism being the opposite of Leucism, causing excesive melanin production (true this isnt the exact opposite, more like the opposite of Albanism since Leucism is a loss in all pigments).