Generally you would need to drop down in pitch to achieve the same RPM when going from aluminum to SS. Being your intent is to drop RPM anyway, you may want to try the same pitch. Once you get the SS, if it needs fine-tuned send it to Mark at Mark's High Performance Propeller. He can alter the pitch either way. I sent my old Trophy to him (which didn't appear in terrible shape) and got back a perfect looking prop that picked up 6 mph... reasonably priced also. I'd guess your holeshot and top end would improve quite a bit going SS.