[Perfectlap]

I had something similar in my Miata plastic window after I lowered it incorrectly and let it sit for a while. It took several weeks in the up position for the deformation to go away but not completely. Very annoying, luckily I found a new top for $300 (with glass) and avoided the whole issue. I would take it to an expert who installs tops to see what he suggests. Perhaps you can replace just the plastic.