One thing lot of aerobatic guys do NOT do , is to balance the airframe about the prop axis
For those who wonder if this really counts - try some good ol flat foamies with the battery mounted high -above the wing and low below the wing
Now do your full routine of rolls snaps etc..
It can and does make a difference on hard core aerobatic models.
Yes, Dick has an excellent point here. That so called "CG" point on the plans is not an indication of where the CG should be. More likely just placed on the plans because no structure was drawn there. All it shows is the balance point with the model level.
A few years ago I asked a famous TOC pilot about balance in the vertical plane. His blank look and rambling answer told me that he had never thought about it.