ZypherI think (could be wrong) Karl himself rides them -1 from center.
Karl has a few different mount points depending on what he's doing. But -1 from true center is one of them.
I've ridden them at true center, didn't have any issues at all. If you're riding mostly park, that's where I'd go. But, it's really personal preference, if you're used to a non-symmetrical ski at true center and know how that will feel, then go for it. I probably wouldn't mount at recommend for pure park though, it is pretty far back.