Joe,

First of all, thank you, I'm the one who did those RCU articles and videos.

A good way to describe the problem you're having is to imagine that you have a quilt on your bed with a big wrinkle in the middle - You slap your hand down on it and two wrinkles appear on each side of it. You slap those down and the original wrinkle appears.

The only way to get it out is to grab the edge of the quilt and pull it flat.

Same thing applies here.

Instead of heating the wrinkle, try heating the areas on both sides of it. So instead of shrinking the wrinkle, those areas will shrink and pull the wrinkle out.

That piece you're doing is small, but tricky. Here's how I would do it:

First and foremost, drill a tiny hole in each rib and in the LE to give trapped air a way to get out.

Now cut a piece slightly wider, but about 2 inches longer than the aileron. Lay the covering over the aileron so you have most of the excess on the curved end.

Iron it down along the straight portion, but leave it loose over the last bay.

Weight it down tightly (Or have someone hold it down) and heat the end with a heat gun while pulling the covering with a gloved hand. This is exactly the same as how I did the wingtip in video #4.