So in the Black master spacing is tighter and serifs of diagonal letters V, W, Y (K, R, X) are merged.
That can be solved by the kerning, but that leaves even more space than needed. Do you keep letters touching or remedy this at the expense of odd spacing?
Ligatures can be effective but there would be a significant amount of them, which is currently not an option for me. I have two kinds of serifs that make the contact unnatural.