if anyone around greenville is willing to let me try a 21 pitch prop on my mercury 4 stroke i am trying to get my rpms up from 5000 to around 5800 and nothing else that i have done is working. i have a jack plate that is set to 3.5 inches prop to pad i am running with a 23 pitch tempest and tried a 23 pitch fury. i am only getting 500 to 5100 rpm and only averagin 47 mph in a 2014 nitro z7. i have talked with mercury and nitro and the standard set up is not working and they advised i would need to go down in pitch. i dont want to but a prop and it end up not working. so if anyone has a 21 pitch that they could bring and let me try a run with i would greatly owe you one.