arborcare, just mess around with your hitch/rope combo in SRT until you get it figured out. I've found hitch cords on small diameter lines like Velocity tend to bite harder, especially in SRT, so thats just something you'll have to play around with.
Cary, what Chip is describing is a trick I've also picked up at the KY comp. Like Chip said, all it is is an i2i prussic, tied onto a doubled ascent rope, with a carabiner connecting the i2i to a separate SRT line which has your rope wrench set up on it. Basically a secret weapon set up, just for SRT. People mainly like it because it allows you to footlock a doubled rope and work SRT. Other ways to accomplish the same task, but this is another tool in the tool box. Personally I'll probably only use this trick for climbing comps. Still prefer to wrench of my access line. But others are different.