Otto, I can take a closer picture of that area tomorrow. I only have 2'x4' sheets, so it can be limiting. The coro isn't attached to the control arm, I could have zipped it, but thought I would wait and see how things go as is. There is only a corner of the coro that is below the control arm, so it does flex.
I will be taking off the warped/melted sheets tomorrow, and can post a picture. I'll measure the distance from the pipe. The coro that had openings melted a bit in a couple of spots, but it is noticeably less wide spread then the areas that had no outlet for the heat. I already cut out the melted area along the opening, so I won't be able to show you the difference, but I can show you what I have.
I like your coro strengthening idea! Simple, but effective!
Thank you!