I've got the Pettitors and they are absolutely awesome. Super stiff underfoot gives them great stability in variable snow, on groomers, and when stomping and the soft tip/tail make them very maneuverable in trees/tight areas, manageable and even playful at times.
You will like the camber underfoot when touring, especially on a steeper slope. IMO the hellbent is just too fat, I like to sink down a little bit in the pow instead of just carving on top the whole time. Also, if the snow gets a little sketchy or you are skinning across some sketchy/windblown area I think you be a lot more confident on Pettitors than the Hellbents. Also, the Pettitors are surprising light for how fat they are.
If I were you I would get the 169 (more like 175), especially if you are touring they will be much lighter. Unless you are sill growing (unsure of your age) then maybe consider the 179 (more like 185), but know they are going to be a chore to get around and a decent amount heavier going up. For reference I am a pretty big dude, 6'5 and around 215 and the 189s are shorter than I am and I find them plenty stable.
Good luck with the decision!