Most skwals I've seen and read about have 11-11,5 cm waist. It is quite enough if you don't do EC. Anyway, even if you go EC, it should not be a problem (check ObiOne vids at YouTube). The more waist you have, the slower curve-to-curve transition will be. I guess big waist may be good for EC in case you want to set bigger angles and for skwalling off piste.