Didn't mean to ruffle your feathers! I agree, waves are not acceptable.
As a DIYer myself, I try to find ways to make things that work, and are affordable. I am by NO
means an expert on retractable screens. But, I like to experiment, and thus far, I'm still experimenting with this.
But, being a DIY-er, one has to remind oneself:
a) how much time am I willing to put into this.
b) how much money am I willing to spend.
c) what will be the end result?
If you make $50/hr doing what you do, then I would say forget the DIY thang, and go down to the local Stewart dealer and buy something "off the shelf".
You will be many $$ and hairs ahead ( or is that hairs a head?).
Besides the screen material, I have maybe $200 invested in my retractable. I have a 2-inch roller with a 1/4 inch wall thickness. So, IMO, so long as the material is attached properly, the roller is NOT the issue here. I think the load bar is suspect, and I will be addressing that soon. Meanwhile, I am living with the waves.