RE: Where Is Correct Balance Point
The 3 3/4 will make the plane a bit nose heavy and the 4 3/4 will take it back into the area of being tail heavy. Where you put it is a pilots choice. I start mine out in the center then fly the plane to see if it should be moved one way or the other. Newer pilots will want there planes more on the nose heavy side. Tail heavy planes tend to be a bit touchy and want to stall quicker.