Just heard that RORC have accepted that they made a mistake. Calculation is very straightforward and Jump was the overall winner. A press release will issue by them shortly.
Just did the maths. You are absoloutly right. Clearly the plus two gets added to the number of entries before being divided into their number of points. This plus two was put in to assist slightly smaller classes with fewer boats and to give them a chance. There is clearly no reason to add on...