Yup the altitude change will make a huge difference on how your boat performs.
I would try an 11 or 12 pitch prop and see if it makes a difference.
One thing that really worked for my boats performance is adding a manual jack plate.
With 3 guys there was no chance I could get on plane and it was pretty tough with 2 guys. Now it takes a bit but I can plane out the boat with 3 guys and hit about 24-25mph. I have an Alumacraft magnum 165cs with a 40hp 4 stroke. My boat is rated for a max of 80hp.
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