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I have that hull with a cuddy (1979 Revenge 22'). I have yet to get it wet with my 200hp HO Etec but, with the original 235hp Johnson that boat scooted around pretty good. 10 hp does not amount to much but I personally would not exceed the HP plate. Do talk with your insurance agent. This subject comes up and gets beaten to death every so often. One camp yes, one no. I am in the "No" camp. Part liability if some one flys out of the boat, etc.... part I do not like going fast on water anyway. You can play games with the power. I am not familiar with Yammies but with Etec the HO series allows you to have the extra horse power with identical hp ratings. They may very have come up with that choice for the plate issues you are worried about.
Garris