Hello. I'm making a set of facial piercings for a specific sim, but the problem is that this sim has big nostrils and lips. This distorts the left nostril and right lower lip piercings. I'm going to try assigning head weights to the nostril one. But I would really like the lip piercing to move when they talk, etc.

I'm aware that face piercings don't work well with high slider values; I just need this to work for 1 sim. Is there a way I can counteract the stretching by using the nose's slider numbers to transform the mesh in blender?

You can try repainting the parts. toggle thru the bones to find the strongest bone weight, at the point of accy contact. Paint the accy, or use the edit vertices mode to assign bone weight, lock and normalize all. Find the second highest weight, assign whatever remains from the first weight to that bone and assign to the accy, lock and normalize. Example, if the primary bone weight is .850, what reamins will be .150, to total weight of 1.000. Delete any other bones. This should help.

And yes, I believe there is a way to make a counter slider, but the math to do it is well above my pay grade, as my hubby would say.