I have a idea for thrust plates. I work at a ski shop and we have lots of ski binding shims.
.5*
1.0*
1.5*

They are specially made to dampen vibrations. This will be the frist plane Ive tried them on. I'm sure it will work, just thought I'd share. They are made by Marker Ski Bindings. Most any ski shop would have them. Probably give them away as they are obsolete now.