The true center/ dead center of Halo's is really different from traditional skis
The measurements on the ski are from the total length of the ski (tip to tail)
- 5 cm is the middle of the turn radius from what I understand. Best carving performance if you're only looking for an all mt ski
-2.5 cm is the factory recommended point. This is the center of the core and center of the running length of the ski. The running length of the ski is the length of ski that touches the ground. There is more early rise in the noses than in the tails of the ski. So mounting Halo's at -2.5cm is very similar to mounting a traditional camber ski at dead center. You will have the same amount of nose touching the snow as you do tail. The core will flex most naturally at this point and you don't lose a significant amount of carving "performance."
0 cm (or dead center) is the middle of the skis total length, but 2.5 cm in front of the running length of the ski. You will have more effective tail than nose. It will feel like mounting a traditional ski 2.5cm in front of its center. Due to the early rise the noses willsometimes feel "tipy" over the front. Since they're 5cm in front of the turn radius, they can sometimes feel "hooky" too. The reward though is lower swing weight and a more balanced ski. The skis will spin faster, rails will feel more natural and the ski will feel "shorter" in a good way.
I have mine at -1.5cm. In the end it all comes down to personal preference and what your looking for