Nice quiver of powder skis!
Retaining stability at speed for a more maneuverable ski (for tight spaces, trees and soft moguls) is a conundrum:
more weight brings more stability, generally, and is less nimble. The same for longer length.
To get more stability, Moment developed the Chipotle Banana, which get turny, I've read, but not with real quickness.
These puppies are heavy.
Besides the 184 Bibby/Wildcat for midweight and smaller folks, the two or three skis I know that position in the middle,
more nimble but also more stable, may not work for bigger folk, and are not Moment skis.
The most likely candidate is probably the Dynastar M Free/formerly Proto 118/189, in its longest length only.
These things are nimble and stable both, for midweight and lighter folk at least. Playful chargers that do soft moguls and trees.
The other is the Head Kore 118, in its longest length. But it probably doesn't work for heavier guys in the same way it does for me,
doing both some nimble, and chop/crud stability.
For me, I once had a list that included the Rossi Super 7 HD and Bent Chet 120, others too,
but I finally decided that more crud/chop ability mattered more to me - less work and more stable for an older guy -
so I've ended up with more powder/chop skis that do crud well, restfully.
This has been at the expense of nimbleness.