Balancing a Scat cast crank

I have now run that crank externally balanced for over 1000 runs and a bunch of street miles. 55,000+. No issues, changed pistons a couple a years ago and had it balanced again externally. The REALLY old, REALLY smart guy who did it is kind of a perfectionist. IIRC Got it to within 1/2 a gram. Way closer than it really needed. Shift it at 6400 rpm.