You're gonna find the noise you're looking for is caused by a combonation of engine size, cowling, and prop size and pitch...I have an Edge with a 1.60 and a 18x10 APC prop it does not have the noise but the airplane performs well. Now my 60 sized Ultimate with a 75 AX and a 14x6 APC prop does have the noise....All I can tell you is keep trying different sizes and pitch and different manufactures as well