I'm a 5'9" 195 reasonably fit solid level 7 skier. I split my time on groomers, bumps, trees and glades equally. I currently have 180 Bushwackers and 185 Nordica Unleashed Hells which are 113 underfoot.
I really love them both and will keep them although the BWs are starting to get beat up so the new SRs will probably be my daily driver. I don't have any issue with the 185 Unleashed Hells in the trees bumps or groomers. In fact I think they are a blast in the bumps and trees so length is not by itself an issue.
I demoed 177 Soul Riders (185 was not available) and I loved them, they were great on bumps and groomers. My question is, since I know I really like the 177 should I go with that size or take a chance that the 185 will be fundamentally the same for me with just a tad more stability at groomer higher speeds?