I actually overcompensated for my Saito 120 installation. I put the servos, battery, and reciever just forward of the former that is directly behind the wing. I had to add a small hatch aft of the wing to acces the equipment in this location. It ended up balancing right at the aft limit of the range. I then moved the battery and reciever to about the center of the bottom wing. It now balances 1/4 inch aft of nominal. That should be a good starting point. I always end up moving the c.g. aft to get a more "honest" flight characteristic.