I'm installing a DLE 30cc in my CMP 72" Hellcat. I'm considering the APC 15.75x12, Graupner 16x8, and G-sonic 16x10 as exchange for the recommended 18x10, 19x8 2-blades recommended props for the motor. I'm looking to fly my plane fast, as close to 80-90mph if possible. Plane has only 11 lbs 4 oz dry weight right now. Anyone has experience with these props?

See if you can get some advice from these guys. Dan.
http://www.zingerpropeller.com/