You have to get the gearing right, but S+'s are very dependent on their rotor.

The best thing to do is get the High torque rotor, if you have the standard/RPM motor. If you have the torque motor the standard rotor is what you want. And youll have to run really aggressive gearing, as in large pinion with small spur.

As far as timing you'll want it around the 40-45deg mark. 20's would definitely contribute to it being slow. 6 degrees different isn't great but might change at higher range.