Almost the entire back of the side fairings have a silver heat material stuck to it.
How does the tank cover fit?
Or how about a piece of hard plastic or aluminum as an insert to relocate the holes and push the plastics outward a bit away from the exhaust?
Have you tried to adjust the exhaust? Some exhausts can to be a pain to install. People use to complain some hit the plastics while others had to issues with the same exhaust.