possibly the most useless member of this site, buy some skis and post when you actually know something. The ski is nowhere close to symmetrical: 109-121-94-111-101 and there is 30cm tip rocker and 25cm (off the top of my head, possibly 20cm) tail rocker.
That said I rode 2 pairs of Halo 1s at true center and they skied ok, for 60% rails I would still go center. Having a little shorter running surface in front than behind the boot due to rocker really doesnt matter that much, it just makes nose butters easier. Being in front of the side cut center does affect the carving performance but they are still fun to ski around at center, I never really found it an issue on a park ski.
there's a certain point where it neither looks good nor functions properly...that's when you know you look steezy - no_steeze