hi all, i bought a 98 181 last year has a 150 efi merc turning a 23p tempest. I've read that this prop is the ideal set up for this boat my prop to pad is roughly 3.5" and i am only getting 56-58 at 5200 rpm wont turn greater then 5200 rpm, threw on a 21 tempest and got 5600 rpm but no speed increase only got 55-56.these speeds and rpm readings are at full throttle and a tournament load. everything I've read is this merc should be turning the 23p around 56-5800 rpm. i haven't had the motor checked by a mechanic but i haven't had any issues with this and the motor runs great. just trying to figure out why I'm only getting 5200 rpm with the 23p, id like to hit the 60mph range people say this boat and motor are capable of. any help is greatly appreciated, thank you
new to the faster boats my last boat was a 16ft skeeter max speed of 38 just grip it and rip it so i never had to adjust anything so I'm new to all this. again thanks in advance for the help guys!