Very very good Andy, you should be rightly chuffed with those. Look like they've come out of a factory.
Solvent shouldn't build as much as water based, you can always run a scalpel along the edge if you're super careful and neat with it before removing the mask. I know what you mean though with the not quite perfect thing. However, for what any of us are charging I think they're really good and as near perfect as you're gonna get for that money
Looking forward to seeing your next ones, your work keeps getting better and better !