I started using shelf liner about 7 months ago. Solved a lot of little problems. It seems the cheapest I can get works the best, holds the pattern and removes easy, I pick it up at a local dollar store. I would stay away from clear, my old eyes can't see it sometimes
I also copied Roff ( more or less) with my aids off the shop vac is fine. I used 3/4 pipe and just drilled holes on the suction end put some nails across the end to block the chips. Most importantly it works Not 100% bit I can live 90
First WELCOME
My only thought is to make sure your blade is tight, and stays that way. You are getting that " ping" when you set the tension, right. Also make sure table is level and blade is at 90 deg. Good luck