I moved from sea level to about 6000ft. I changed out my jets (no adjustment screws on these carbs) according to the Merc specs, and had a mechanic give the engine a once over, check compresion, linkages, and change timing. He said the only other thing I really needed to do was go down 2 or 3 pitches in my prop. So I replaced my 3-blade stainless 24 pitch prop with a 3-blade stainless 21 pitch prop. Well long story short, I can kill the engine trying to get on plane without much trouble. If I have my friend walk up to the front of the boat we can usually get on plane, but not when we're both seated. The boat is only a 17ft fiberglass bassboat so nothing big. Is it possible it just needs an even lower pitched prop, or does it sound like it needs more work. Once on plane it'll do 55+mph and starts great. It seems to be running fine just not enough power to get up and go. The motor is actually the max the boat is even rated for so it cetainly shouldn't be underpowered.<br />Any suggestions would be greatly appreciated.