Replying to Where to mount/what length Kung Fujas?

So I'm sold on getting a pair of these skis, they sound dope for exactly what I'll be riding this coming season. This includes: west coast pow (wet shitty slop), nicer interior pow, park, groomers, tight trees, open glades, cruddy stuff, pow jibbing.
Yeah, I plan to use these skis for pretty much everything, so I'm really not sure where to mount...

I have center mounted invaders and those really suck away from groomers and park, and I have really far mounted back PE's that suck for jibbing and park and skiing switch.
I want to be more jib-oriented, but still not really held back for ripping a bit.

Next, what length do you think I should go for? I'm 6' 145ish, don't really ski super aggressive or powerful. I'm thinking the 189 would be too long for trees and quick turning, so I'm leaning towards the 179. Thoughts?

Thanks