I'm having trouble with windlace wrinkling on the tight corner around a wrap-around windshield. In the past we have used cloth or leather covered rod and never had a problem with wrinkles, but using vinyl and it wrinkles alot. I have steamed, stretched and cut relief cuts right up to the stitches and it still wrinkles on me. The vinyl is sewn and the sponge rod is not glued to the vinyl, in less sharp bends, stretching and reliefs work great, but this corner won't smooth out. is there something I'm overlooking or is it the nature of the beast?