i can go as fast as i want to on my hellbents, havent had any problems with them being too soft.
but on big drops when you land alot backseat they might be a bit hard to control. for your weight/height, i would recommend you the 189. ive tried alot of powder skis, but the hellbent was the ultimate tool.
the only "downside" is that they have a high swingweight. its actually hard to do 180 presses, since the swingweight just always makes them 360 presses.
at the beginning i was worried about the length and weight, and thought that i couldnt handle them, since i only weigh 150 pounds at 6 foot, but once youve clicked into them, they ski nearly as easily as my park ski. especially in powder they are really playful.
however if you like to take big drops and hit chopped up pow, then id suggest you get a stiffer ski, like the one life, or the JJ.