I'd like to play with my SUV1200 with 05 FXHO motor coversion. I had a new Solas DF 14/20 prop and it didn't grab off the line like I'd like it to (6-7K RPM to launch). I now have a stock HO impeller 13/21 in it and it launches better (5K RPM). What would I go to next for even a lower RPM launch? Max RPM's appear to be the same and top speed is the same (50), with a little better on the 13/21. I can see the 13/21 has a "Longer blade length longtitudinally". What would be a good one to try? I'll sell my DF 14/20 with 40 minutes time on it or trade to try another.