i wanted the other kid to elaborate.  i know i'm going to get hated greatly for this but if you can't ski a park ski such as an invader out of the park you need to learn to ski or stay in the park.  now i could understand if you skied cascade concrete or east coast slush it would be impractical to use but it should still be skiable most of the time.  i ski on atomic urban punx (another symetrical ski) all over the mountain; park, trees, pow, moguls, groomers, etc... granted it is a little harder to go fast on groomers or ski moguls hard it is still very skiable.  montana does have some of the nations lightest snow so that helps.  one of my best friends charges on his invaders; hell he even charged the ridge at bridger on them (not sure how familiar you are with bridger but the ridge is basically gnarly inbounds bc full of cliff bands, trees, rocks, etc...)
CLIFF NOTES:
if you can't ski invaders out of the park either just stay in the park or learn to ski