The clubbie boards are built for in and out paddling, but they are also designed for "parallel" paddling (butterfly stroke), or Australian Crawl paddling, which is a vague equivalent of the "alternate side kayak paddling".
On a SUP we stick to one side or the other for a longer period, and I think those cutting / piercing SUP noses are definitely the go in flat water, and BOP (Battle of the Paddle), as they help to act like a front fin, and help keep the board on track.
JonesySUP, regarding best shape for BOP, have a look at the Naish Catalina as a starting point. They feel quick.
Also hunt around for more pics of the Bark 12'6. Or DC 12'6 made on the Goldie.
www.seabreeze.com.au/forums/Stand-Up-Paddle/Review/bark-126-competitor/Riviera 404;
http://www.rivierapaddlesurf.com/collections/all/products/404-126-monster-race-boardThese "cutter" noses on the SUP's will stay on line (track) much better than a 12'6 in the Clubbie style. (in my opinion)....