Found this vid over on deeper blue thought I would pass it on to you guys if you hadn't seen it. This same thing happened to me with a pair of Omer FP mounted on c4's, after that I switched to Speardiver blades and Pathos FP which have no mounting tab or large protruding channeling fins that would always snag on everything. Stay safe
http://www.youtube.com/watch?v=EkVNjV7RhLI&feature=channel&list=UL