I used some sticky foam about 3/16" thick in that area, but placed it on the metal, not the sail panels. I did the LizardSkin on the interior so probably wasn't needed but it was an easy install. I thought I had a photo, but apparently I don't. Here is what I used:
https://www.amazon.com/gp/product/B0BNBV7WK6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1