im using yamada mix 20,20 i get this from probuild.going back to the prop size,dont forget youve two different planes there which require,different throttling.i found with the 13x4 wide on my 63 in the seductio freestyle it seemed to be more flat out than on lower rpm,when i put 13x6 on it tottaly transformed it and was better on 3d transition between manouveres.