I'm not a CRP, but in principle it shouldn't matter.

I have a craftsmanship set that has 190 craftsmanship at the expense of everything else and a similarly-built outfit with 174 magic craftsmanship. I don't have Byregot's Blessing or any of the other high-level quality abilities, so I need Improvise. If I use the correct set I can get 400-500 quality on a tough recipe using Great Strides, Culmination, Brand of X, Improvise, and Manipulation. With the sets skewed this much, it's very easy to tell if the recipe is craftsmanship or magic craftsmanship, and the lack of control means I get an unstable element most of the time unless the recipe is low enough that I don't have many fails.