The first time I rode my new board I had my bindings width at around 22"/56cm, which is the boards design stance. Is that like the designed stance for the board where it performes best? Cause yesterday I went with a wider stance, 63,5cm, and the board dident carve as good.
an 8 cm difference is quite a lot.
basically, the optimal stance depends on physical height and personal taste.
i use a 64cm stance but i am 190cm tall with very long legs.
what is your height? if 56 feels too narrow i would suggest trying 60.