I'm beginning to wonder if what you are seeing is actually a problem, or the normal visual dyeing differences between matte and polished surfaces.
The "no change between time steps" makes me consider this; the matte has more surface per unit area than the polished, it will require more time in the dye than polished to get the same shade. If you reduce the PSI and/or use smaller beads; so that the matte surface is somewhat less matte (smoother) do things improve?
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