Ive had a copule of the boys boards. Probably some of the best surfing boards on the market.
Rode the same dimensions in a few "pointynose" asian pop outs. the turning arc and rail to rail surfing of the laguna was better. Nose width didnt come into in (20" compared to 17"). if anything it helped with stability and nose riding was better.
They certainlty didnt ride longer.
I wonder how they would compare to a 'pointynose' custom Oz board such as the DC - although obviously there are so many other factors that affect performance.
I would have thought the wide nose would help with stabilty as you say - allowing them to go shorter. The light weight of all these 'custom' boards would play a huge part in their looseness compared to a pop out - in smaller surf - I would have thought.
Anyway, I find it really interesting the way SUP design is heading off in a number of differnet directions - great for the progress of the sport IMO.