Shrike Balance
The CG of a plane isn't that critical.
Just try to get as close as you can, and that will by just fine then...
You won't notice a lot of difference (if any) in flying the plane with the CG 1/16th of an inch more forward or backward.
Such meticulous balancing only becomes necessary when you approach critical CG settings... the point where the plane becomes so unstable you are unable to fly it... the CG as it is on the plans won't even be near the critical (most aft) CG...