I recently picked up a pair of 2015 K2 Shreditor 92's in 170 length and now I'm second guessing my choice. I'm 6' tall and weigh 155 lbs. I have been a snowboarder for the past 20 years and I'm just getting back into skiing so I would say I'm "intermediate". I will be skiing mostly in Eastern Canada and the US. I prefer skiing in trees and off-trail but also some groomers. Should I stick with the 170's or go for the 177's? Cheers.