Hey fellas,

Currently running a MVVS .40 on my .40 sized stik and i'm having flutter problems because its just going too fast. Seems like any throttle position past 1/2 and the engine screams with power. Its been tached at 17.5 on the ground. I'm running a 10x4 on the engine because that's what was on it when i bought the plane from a guy getting out.
What prop should i be running to lower my airspeed but maintain my power? I tried the mvvs website, but they don't recommend any props.