AH, that's so wonderful to read! Yeah, it's always a challenge with additive color blending to simulate subtractive. If you increase the "Chroma smudge" dial, it will try to act a bit more subtractive in nature, but it's a risky one.
The challenge is that you can't quite do it directly with RGB. In subtractive color blending you are working with the spectrum and you essentially subtract wavelengths when colors combine. I've tried some sort of approximation with my Chroma solution, but it's totally heuristic. One day I'll come up with a better plan for it, I promise.
My advice, though, is to embrace it's nature for what it is. Again, the chroma smudge amount adds a very unusual behavior to digital colors, which feels more familiar with the curiousness of real paint, but in its own sort of "fantastical" nature. Certainly something you should explore and play with. I love it.
My favorite thing is what it does to blending into really dark color with brighter colors. If you filled the canvas with almost black but some hint of color and then painted with white on it and smudge, some really magical things can happen!
Thanks again for your reaction and don't shy away from rolling back drivers! It most likely will not hurt your machine and I imagine the later drives haven't added any dramatic advantage, or have they? I don't know, honestly, but I'm assuming it's no loss.
In the meantime I'm still working on Vervette to make it happen. So many neat things are on their way and I am having a blast. Just some other things I have to take care of, too, which continue to hold me back a bit. But I'm not letting go, that's for sure!
Cheers and post some stuff!!!