RJ, Go back and read Phils post. There is no “have to” since everyone has to nuance their set up. For instance, I ran a 26 T on my 225 and it did well. A friend had an identical set up and he liked the 25. I did not remove any plugs from my prop and he did. Oldtimer recently gave a great description of how to set up your prop with regard to hole shot and how to measure plugs to take out. Do a search, drop your plate, and enjoy total performance.