Unless you rock an extremely close stance with little to no angle you should be fine. The waist width is measured at the very middle of the board where it is the smallest. The board gets wider the father you go out (where your bindings will be) and should be fine.
My stance is just outside my shoulders....
I love this board and am willing to chop of my toes to prevent toe drag.
wait no toes.....aw crap
According to burton my footprint should be around a 10 since I am an 11