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^Then honestly, you are doing something wrong.
Seriously.
Hellbents are fucking mack trucks. When the powder gets tracked out, you get your weight forward and they crush the tracked up pow/crud. The 189s are long and heavy, and they level anything in their path. Sure you get a bit of tip deflection but just ignore it and you realize you are flying over things that you couldn't possibly on a smaller lighter ski. A pure charging ski IMO is really the only thing that will give you noticeably better charging performance. The combination of huge tip, rocker, and dampness/weight allows Bents to crush at speed. Since I have been on the bents not a single one of the skiers/snowboards I ride with can possibly even imagine being able to keep up with me in wideopen tracked powder bowls when I am on the bents. Not trying to say I am an amazing skier but Hellbents, literally, allow you to do things you can't do on other skis.
They rock groomers really nicely as well. Definitely not a carving ski per se, but if you can't carve down a groomer on Hellbents you honestly just shouldn't be on a ski like this anyways.
The 179 would probably be pretty good in the park as well, honestly though the 189s are really big, heavy skis, I have never taken them in the park.