I've been fighting to get my Xpress H51 right, and sent my prop to Mark for repair and add cup...Boy, oh boy...Mark did an OUTSTANDING JOB! I now have a boat intead of a floating turd...The improvement is outstanding, boat is as it's supposed to be...Anything else that I plan to have done with motor height, and adding a jack plate is just Lagniappe! Prop before 40 gps, 5500 rpms, splash line at drivers seat...any time there it would start to porpoise...Now, this evening 43 gps tops, 42 gps cruise all day, 5700 rpms, water pressure is 15 psi @ WOT, boat handles great, and NO BOUNCING! Boat before was a 38 mph cruise at best...now I'm looking at 42 easy cruising, splash line is between me and transom...
Mark you did an outstanding job on my Stilletto 15 pitch!

Now full disclosure, boat will porpoise if one trims it past the point of no return.
I plan to add a 6" vance, raise motor to what it will allow, and stick a micro power pole on port side.
Life is good!