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Most outboards are designed to able to reach a peak rpm of 5500-6000.  If you're only getting 3600, and not getting on plane, you are definately over propped, and as was mentioned, overloaded.

The real problem is, a 35 horse engine on a planing hull should at most be pushing a gross load of 1400#'s, ie boat, engine, fuel, gear and people.  I was running 3 adults in a 20' skiff fairly lightly loaded and a full tune honda 50 on flat water, and it had just about the right amount of power.

I know, you have no choice with the Kenai hp restriction, but the american power boat association recomends a loading of ideally 25# per hp to a max of 40# per hp for planing hulls.  Thus a gross load of 3000# would require a minimum of 75 horse.

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