There are no "balance issues" you simply have to sail the boat and not just stand anywhere you like. Its the same as any other cat with the exception that when you get it wrong on the F20 its clearly wrong.

The Board position was decided from the testing on the original test platforms and also calculating the effect of the wider beam from what was tested.

As for Simon's question: as soon as there is load on the foil then the COE is part of the RM equation. Load is on the foil very early, even on straight foils.