I wanted to get a spare belt so I replaced my OEM belt with a gates belt. After I installed the gates and went through the break-in process It feels like I have more shuddering on the slow take-offs than I did with the OEM belt. I might swap it back when I get a few more miles on the Gates belt to see if I can tell any difference. I did clean the sheaves and all that during the swap. Just an fyi I believe it said to never use brake cleaner to clean the sheaves.
That heat shield video looked exactly like mine.
I took it off to see what the deal was because I hate a rattle. when I separated the heat shield this fiberglass material fell out from between the shield and the exhaust pipe. I believe that's what they were using to keep it from rattling. I purchased some high-heat material kinda like what you would use on the manifold of a car it reminds me of the fiberglass insulation you would see on rolls for your attic. I trimmed enough to go between the pipe and shield to stop the rattle.