-2- On the start line luff them up. The new A-cats with their flat keel lines and narrow daggerboards tend to have a high rate of drifting downwind. The F16's suffer less from this. So the A-cat has to luff but can't, when he fails to stay clear then protest them out of the race. Ignore the frantic shouting of the A-cats sailor; if he (or his boat) can't handle the heat on the start line then he should start on the second row.
Remember, you must give the boat above the ability to keep clear; you cannot just luff up at will.
