Just remember that the "Recommended" CG is just that - a recommendation. Start slightly nose heavy just to be sure that you're not tail heavy. Then fly it and adjust from there.

For the record, I just balance with fingertips and eyeballs. Once the plane has flown, I'll shift or add weights in small increments until the plane flies as I want it to.

I never re-balance it unless it flies well and I am going to make a major change, like switch to a different engine or something else that might change the point where it currently balances.