[Blue Bomber Man]

Okay couple things:

First off great idea! I think you might be able to stick with the strong springs if you just lower the initial angle that the coroplast or move the connection point on the flap you could probably get it to move at the speed you want.

Any chance I could get more info on your wheel covers? They look pretty slick and may prove to be an easy solution for my wheels. I have aluminum alloys that came stock.