Ha, I've killed my share of gadgets trusting a label too.

Been there with poly mounts on a street car and the vibes get old fast. A few things helped me: check that the mounts are torqued with the car sitting on its wheels at ride height, not jacked up, since preloading them makes the shake way worse. Also look at the trans mount and torque arm bushing, because if those are still soft the engine is fighting them and you feel more of it in the cabin. Some guys run a stiffer mount on the engine side only and keep a rubber one on the trans to cut the buzz. Give it a few hundred miles too, poly does soften up a little once it settles in.

50 meetings is no small thing, so first off, congrats on keeping it going that long. Our club in Buffalo has been at it since 2019 and I'd say we usually get 4 or 5 out of 9 finishing, so 3 of 7 sounds about right to me. Nobody's ever been kicked out, and honestly the folks who didn't finish still show up and have plenty to say. Part of the fun is hearing from the people who bailed halfway and why.