Moved from KS to Colorado last year. My 198 Champ has been in storage for the last year while we built a house so I finally got to put it on a lake in Ridgway, CO this week. Elevation is above 5000 ft. My hole shot was awful. Talked to local Merc service dealer and he suggested dropping to 21p prop from my 26p Merc. That seems like a pretty drastic change. Any guidance on hat prop to use? I may run on lakes as high as 7000' but also want to run on lake Powell which is about 3700.