Personally, I'd say your prop is perfectly matched. I don't see tremendous gains in that last 200 rpm except more engine wear and worse fuel economy. Hard to say for certain that your tach is super laser accurate either. Not to discourage you, most marine shops, or friends, will let you test props. There are specialty shops that tweak props, but they are geared more to the lake Havasu 150mph type boats. If speed is your goal, making more power helps. A word of caution, be careful pushing the boat past it's design limitations.