my machining method, which places the ball within about .0002" of center may not justify further balancing.
Not sure but I think all the big makers do not balance their tops but they use accurate machining methods, as you do, so that their tops come out from the lathe already balanced.
I prefer a more accurate balance for my tops so I always fine tune it. I do so mainly because I don't like the wobbling due to unbalance which comes out at slow speed.
I check for static balance, wich is more than sufficient, and only rarely dynamic balance;
because of the way I make my tops, I can have the tip slightly off centered, which causes static unbalance, but not couple unbalance, so practically I only need to correct the static one.
I use the balancing grub screws only in tops with replaceable tips; each time a tip is replaced, the top needs to be balanced again, and the screws are very practical for this aim.
With a fixed tip instead, if needed, I prefer to correct the position of the tip and/or add a permanent weight in the top.