How much can you go up in pitch on a prop from what it was original cast as? I am looking for a 30 pitch chopper. I can turn a 28pitch 15" 4 blade Drag IV to 6k maybe even a little past that to around 6100. I am thinking in a 3 blade I will need to be in a 30 pitch. I have seen a few 28 pitch props for sale but, wondering if they can be made 30 pitch propellers if 28 isn't enough?