I know, this is an older post but... I also have a 1750SR w/the 3.0ltr LX, but was unhappy with acceleration. I switched to the 19p x 14 prop. Tops speed is a little lower, about 44mph all trimmed out. But the take off is WAY better! I will switch props depending on what we're out doing, since the other prop tops out at just under 50mph.
SSgt Seth Allen