heres my delima, i have a 68x36 sensenich and turning it 3000 and i think its a FAP 70x36 it has a slight cup, turning it 2950. i have been told a cupped prop pushes better. im lookin to get a 70x38 to bring down the rpms but theres so many different cuts and shapes and differences of manufacturing (cup) (flat) skinny fat ,well you get the picture. the sen 68x36 is skinner but it measures 69...i dont want to spend 600$ and it not be optum performance...if i were keeping this boat it would be a no brainer!! POWER SHIFT ...is there any one with a 180 that still runs a wood prop?? help...both the props i have are pretty good but both have nicks in the leading edge that pierced the metal and i dont feel comfortable turning 3000...wish there was a warning light (beep beep lower your rpms leadfoot cause your about to sling a tip)lol or some way you could check the tips before you head out...thanks scott