I am not too worried about the layout in relation to ball reaction, More just to make the weights legal.
To be honest a X-hole in the centre grip would be fine, As i see all sorts of patterns im sure ill find a use for it, the balls to my knowledge are USBC approved and are legal in competition once the top weight is removed to meet the requirements. for example some of the balls came with 4'' pins, and 4oz top weight, and was marked FDO, again at a very reduced price!