I mid wide is most likely going to be far to wide for size 8 boots. I wear size nines and I know it would be to wide for me. With that being said I am on my phone and can't check the board specs at the moment.
My GNU Street 149 is has a waist of 25... Is .3 make much of a difference? what would be the drawback of the board being too wide?
slower edge to edge...
that is why you center you bindings and boot so in a perfect world you have some overhang on both sides of the board...so the board will listen all the input that the body is giving,and no need of overcompensating for it !!!