Have a 05 champ 187CX and found out about a month ago on here to set motor hight at 3.5 inches below pad. It did bring RPMs up to 5400 and speed to 53 mph but steering was stiff and exhaust was loud. I dropped jack plate down an inch and got back the ease of steering but lost rpm to 5200 and speed to 51 mph.
Would a different pitched prop help? Have a 05 J150PLSO with a 14.5 X 22 pitch prop. Not sure of brand.