Yeah, pretty much how we’re doing it…for now anyway 
Steph will likely refine this in the future; and there were lots of great ideas presented in here thread.
I think masking is still done in 8bit, so that’s probably where the artefacts are from.
I still wish we could toggle off an active mask so we can paint without seeing the dark shading though.
Reading around the forums it seems like at one point you could do this, but was then changed. It doesn’t help that the masking value was also changed to a darker shade a few versions ago 
ah well, so is life