Jake, I think you and I are in the same position. Our PLA layer is only 0.1 mm in most places, with PVA under it for support. We've set all of our layers to print thin. This may be part of what is causing issues. I am trying to swap between our PVA's now, with one always in a bag with desiccant. and one on the printer, and changing between the prints. We'll see if it makes a difference.
Our next problem to fix is PLA warping....