I wouldn't center mount Karmas.
1. They aren't really a park ski
2. They are good in pow (I think) so center mounting would make pow harder
3. They are not symetrical so a true center mount would make them very squirly.
If you were talking about a core center that would be an ok idea but if you really want a center mounted ski go for a park ski or a symetrical ski such as Invaders, Addicts, of Urban Triplets.
Use your Karmas everywhere but park and pick up a cheap park ski if you can. You'll get more days out of your Karmas that way and have a park ski.
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