I am flying a Phoenix Topstar60 with a OS FS91SII and MAS 15x4 prop. The airplane flies exceedingly slowly with it. Though it remains fully controllable, I want to try out a different prop that has more airspeed and pull that I can still 3D with. So a few questions:

1) Should I get APC or MAS? The 15" is the largest prop this airplane can take. But it tends to hit the ground once in a while. I dont want to break a tip on a APC

2) Recommended prop range as per the manual is 13x9, 14x7, 15x6. So would a 14x6 fit the bill or should I get a 14x8. Basically, 14x7 isint available, I dont want to get too high a pitch as I dont want to reduce static pullout out of hover. Also, in the 14" range ground strikes are not likely. So should I get a APC then?

Ameyam