The Winthrop Roller Guides which have been on the marketplace now for a while has a disgn similar to the Fin Nor guides which eliminates this problem of line pinching by the recess in the frame making it impossible to get hung up. The guides are more money than regular Aftco, and Stuarts but are away of curing the problem, They are a very very nice set of roller guides. Here is their site
www.winthroptool.com check them out!! You can view the recess in one of the guide shots.