I have the Karmas in a 177.
WIth the amount of time you spend in the park the Karma isn't going to be your ski. It's probably the best all-mountain twin made, and if you get it in a size one smaller than your usual it'd make a killer pipe ski mounted at the FS mark.
Snag a set of new 4FRNT STL's if you want a solid park ski that can handle itself on the rest of the mountain alright.
If you're spending more time on the mountain than in the park, then the Karma is one of the best skis out right now, but if you're not, then you'll be using it for something it was never intended to do. Volkl makes a park ski, the Dogen.