I have a 15 ft flat bottom aluminum boat (what I call a suped up jon boat) with a yamaha 9.9 4 stroke on the back. This thing runs great, but as with anything else, I wouldnt mind getting a few more mph out of it. As the motor is currently mounted, the anti vent plate is about 1.5 inches below the bottom of the boat. My question is if I move the motor up to where the anti vent plate is even with the bottom of the boat or maybe just a bit higher will that speed me up much more, or do I just need to leave well enough alone? The motor does a fine job and is very fuel efficient, but so many people have told me to move the motor up. I just want to know if it will be worth the time invested. Thanks in advance for your help.