You talking about testing for what degree of angle I would need to start with?
too much "up" angle at a high enough speed will drive the boat out of the water. at the same time, too much down and you'll be plowing the nose. optimizing the angle -should- give you better performance because you're lowering the thrust centerline (i.e., making the boat ride higher on the water). porpoise can also start occurring when there was none before.
wot is Wide Open Throttle.