i was thinking of buying a spare prop and saw that the hustler is on sale here on iboats. i've heard they outperform standard aluminum. are they cupped at all? progrssive pitch? was wondering because i need to know if i should drop pitch if i order it. i'm currently running a yamaha 60, 19 pitch yamaha aluminum prop, 2.33-1 gears. wot rpms 5500-5700, top end 37-38. i would like to at least stay close to where i'm at now performance wise. should i go with a 19 or drop to a 17 when ordering the hustler?