I noticed your email and I'll reply today.
As for upgrading to a Stainless prop, My opinion is, Personally I have never hit anything with my prop and it's still in perfect condition, but I have a lot of friends who have hit things with both stainless and brass props. The friends with the brass props have destroyed their props, but the friends with the stainless props have bent shafts, busted transmissions, etc. The reason is when you hit something with the brass prop it's more forgiving absorbing the damage while the stainless prop may not receive much damage it transfers the hit and damage to other areas in most cases causing more expensive damage.
A stainless prop does give a little more pop out of the hole. It's a definite needed boost on a boat having a hard time pulling up a rider, but I don't think it's needed on the X-Star. I've pulled up four wakeboarders and one tube at once fully weighted with mine.