Just to have fun, the Overdrive 11mē work great on the Phantom Race, I don't know for the other. But yes to make it softer you can use the 520 Blue Line or the 530 Red Line with tip extension.
For the other unknow for information :
Planche Mag ( March-April 2008)
Tester's opinion: Arnaud 1,80/97kg
The OverDrive does not belong to the group of nervous but powerful sails. It is soft and thus the most user friendly sail within its group. It shows a good combination of user friendliness and performance. It is the perfect freerace/slalom sail.
+ Light, soft, comfortable. A good compromise between easy handling and performance in a wide wind range.
All the best