Looking for someone with experience using the Honda prop calculator. My brother bought that 4.8 XL Naiad and repowered it with a BF50D. Honda recommends a 3-blade 11.125 x 14 or a 3-blade 11 x 15. We're breaking it in with a 3-blade 11.6 x 11 and getting 6200 rpms at WOT. Any thoughts?