An even easier way to set the CG is to balance right on the main wing spar with the front of the spar being the front end of the CG range and the back end of the spar being the back end of the CG range. You can feel it pretty easily and is the perfect spot for this plane. It will then require just a little bit of down elevator when inverted.

Do not worry about getting the CG just right, this plane is very forgiving. I am actually way back of the recommended rear most CG and it still flies very well and is not everly sensitive plus now it will hover and torque roll not well but it does do it, tumble and I even had it pull the nose up into a vertical climb from a Knife Edge and it's bone stock using a Saito 91 and an APC 15X6