Great description. Mine used to do that before I added the dowels. That was two years ago. Haven't done anything to my mirrors since then except use them as intended. No more wilting.
Its been awhile since my last post in this thread, so now we're updated with the dowel progress
Discussion of the dowel mod starts at post #365 here:
Who else besides Cyborg has tried the dowel mod/addition?
I may have missed some of those posts, and I'm curious if the dowel mod DIDN'T work out for someone