I agree with everything you are saying but I think we could measure everything until we are blue in the face. I have been buying props since 1975 and have never measured the location of the hole in the hub. I balance my pylon racing props (gave up balancing sport props decades ago), but APC props are almost perfect out of the bag, from my experience. And when I have had to pull one directly out of the package and install it quickly between heats, I could not tell a bit a difference. The only time I could ever attribute a poor run due to an imbalanced prop is after a prop strike. It reminds me of an old college engineering course addressing tolerance standards and how we can introduce more errors in our data simply by our poor measuring abilities.

Kurt