Joe,
My CG is more forward than yours. By looking at your picture you included of the extension area for the battery mount I can tell you are running a much more negative cg. I did add an extension but much less in length. Using a Rhino 4900 when practicing I locate the end of the battery (end with wires) 1/4 inch from the back landing gear fuse honey-cone support. When flying the plane needs only a touch of down when inverted and on a 45 up line will not change tracking when rolling to inverted. Slow rolls and 4 points require very little rudder. Down lines are straight with a 2% mix. In the wind which we had plenty of this last weekend at Myrtle Beach it tracks very well especially if you use that left stick.