Well being on the cg is good, also remember if you plan on doing any knife edge you will want to center or at least balance the weight top and bottom where you need less imput with the elevator during KE passes. The more weight on the bottom of the plane, the more it pulls to the bottom, and the more on top the same, I try to keep all my weight on the center line as much as I can because they roll and track better for precision flight.