I concur, break her in on a 16x12, then if you want (the 16x12 has huge power....) some other options that I like are the 16.5x12W, the 16x13 (if you are light sub 10lbs), the 16.5x12. I have not ran a 17x12 mostly because I really have had no need since those props above work very well for me.

A couple hundred flights on mine running 18% low viscosity oil/25% nitro without any greif whatsoever, gotta love em, hats off to YS.