Nice banners Mike..
If you want the ripples out of banners, I've hung them with some extra weight on the bottom, and turned the space heater on them for a while, not too close mind just close enough to warm them. After 20/30 mins turn it off, but leave the weights on for another 30mins+ until it cools, and they are gone. I've never unrolled them months after to see if they are still gone, but I would assume so....if I get any others like that, I'll take some pics.