I played around with this a little last year. I'm 6'2 and 230 lbs. I normally ride +13, -13 @ 22.5" stance. I tried +13, -9 @ 21" stance and the out come was a tron meniscus to me knee, not bad enough to require surgery but a rather serious injury none the less. needless to say i'm back to what feels comfortable for me. You can't base your settings off of what others are doing. Everyone's skeleton is made slightly different. For instance if you a person that walks with toe out you hip joint is more likely than not a little rotated backward and if you walk slightly pigeon toed than it could be because your hip joint is slightly more forward and if you walk toes straight forward then you hip are dead center. Now this is not the only causes for said foot types just going on skeletal make up. With that said your setting are individual to you and what works best for you and how your body is made.
My reaction to first snow fall
2012 NS Legacy 163.
2013 NS Brothers in Arms Cobra 163.