I removed about 1/4 inch worth of hook on the last foot of my jet and it gave me about a 3mph gain! I can't wait till I can flip the boat over and do it right to blueprint the bottom!
I just checked mine with a staight edge and removed the material until it all lined up.
Just make sure your hull is thick enough and if you feal you removed too much for hull strength sake just apply some more glass on the inside of the boat to compensate.
Good luck