Do you hand cut your quarter windows?
I'm sure others have thought about this already, but when I can't see well where I need to cut I just shove my white card in between the window and gasket and pow right in the kisser...|
I'll do that with back windows too, only with a white towel. Of course a light works better, but sometimes I only need light in a small section of the glass. When that happens I just throw the towel in and it's good. Not so much the case with 5% though...