Ooh, that's interesting. I'll try that out for a while and see how I like it.I won't be able to record a video, but CriticalCubing has this video which shows his U perm executions. What I do is I think a little more subtle, but it's a combination of the same sort of thing in that video. The U perm is unusual because it has four consecutive R turns in the same direction, where as three is the most I usually do without a significant regrip. More than three consecutive turns in the same direction is really rare during F2L though.