I'm not going to jump on you, as I don't know enough.
Just raising questions based on limited experience, in the hope the more learned will offer up the truth.
What I do know, is that the Paint will begin eroding the moment you first start the engine, thus ruining your fine balance with continued use.
I would think that you would be better off balancing to that accuracy, and then painting and ignoring the imbalance the paint brings in.
A knowledge of the permitted imbalance error would be helpfull....
I base that on, what a coat of paint actually weighs, and seeing how much material I've seen engineers remove dressing aluminium props without a rebalance.
I'm probably wrong, but without further education, it sounds like you are going a little overboard
Cheers
Jas