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If you look at the motor in the fully down position, the prop is actually pointed slightly down as opposed to exactly level in the water. This will have the effect of pushing the stern up (bow down) which gets you on plane faster. It will also increase the amount of torque resulting (single motor) in a pull or lean to port. In this position, when on plane, not all of the props power will be translated into forward push as some will be used to push down the bow.
When on plane, raise the engine until the prop is pushing parallel to the water surface. This will raise the bow slightly and use all of the engines power to push the boat forward. This will result in increasing the RPMs at the same power setting. It is more efficient. If you go too far, some of the power is wasted in the other way.
Here is what I do. I keep the engine all the way down until on plane. Then I raise it and watch as the RPMs increase. Usually this increases my RPM by about 100 -200 at a given throttle setting. See how the boat is riding in the conditions you are in and adjust from there. Too far and you will cavitate.
It takes a bit of experimentation to get it where you want it. Also, the closer you get to level the less you will see the effect of the torque resulting in a lean.
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