Starting in Jan. 2020 they will allow up to 3 oz of static imbalance.
The weight hole restriction doesn't go into effect until Aug. 2020.
So if you plug just the weight hole you will most likely be legal.
All this hand wringing over nothing.
And 95% of the stuff that has weight holes you won't be using in 2 years.
So what you can't use liquid cleaners during competition. I know of very few that use cleaners during competition. Clean your ball before or after.
The oil absorbtion rule will have more effect than anything and old balls have been grandfathered in.
So many complain for the USBC to do something and then they do they all cry foul.