I don't like that wide of a stance personally. I have a Cobra 161 and I use Salomon Chiefs set at 21 1/2" on center and 12/-12 degrees. With the bindings all the way out, you have them set at 24 1/2". I'm sure a tad more with the 163.
I'm 5'10" tall and 215 lbs.
With regards to your other post about the cobra stiffness...I thought it was a stiff board when I first got it last year. After riding it and a bunch of other boards, I now realize that it isn't that stiff. I'm glad because I like a softer board.
I've used the following bindings on my cobra: Salomon Chiefs (preferred), Union Atlas, Union Contact Pro and Flux DS30.
but i guess my question is.. do you ride other boards.. and do you change the stance board to board? thanks for your help bud