Sculpting Smal Detail Sculpting

Because I'm a masochist who started with 1/12th dolls, I've been having a lot of trouble doing finishing sculpting on my doll's faces, I keep losing eyelids, and ears and sometimes even the sides of the head will just start to warp as I try to add on to them. I'm using premiere clay and ideally I just want to start working in some kind of additive that will combine with the clay so that adding clay or sanding work won't leave seams between the pieces.

I mean the scale I'm working on is literally so bad that I'm getting eye strain every time I put a serious effort into working on them anymore, and then my hard work falls to pieces as soon as I try to make any new changes. I'm considering adding/switching to magic sculpt, but I'm worried about how well they'll blend and if it will ruin any of the progress I've made. I don't really want to start over entirely, but it seems impossible to finish as it is. I think maybe I need to start using a primer but I'm not sure how well I'll be able to add more clay.