Super jealous of those tree runs. Things are usually tighter over here.Well, Korua Shapes seems like an obvious option.
Dart if you want a super responsive board in any type of powder (imho it's even to agile sometimes, and you have to be gentle with it), or Cafe Racer if you want more stability and a less nimble board. Didn't try Pencil but due to swallowtail, it should be good in trees too)
Here you have some examples.
High speed treeriding (middle part)
Denser forest and much worse snow conditions (uneven terrain, a lot of tracks already and bumpy as hell)
Imho most boards with volume shifted and swallowtail will give you what you're looking for. I'll be testing Nitro Dropout in the next few days in trees.
Volume shifted doesn't mean it's obligatory good in trees. Nitro Squash isn't the best option, slow, like a tank, works ok, but it's way slower in turns than Dart i.e. My buddy had Squash and he couldn't keep up with me in trees. I rode Superpig a few times on piste, and tbh I wouldn't use it in trees riding high speeds, not enough control/agility to make quick corrections.
I agree, not all volume shift boards are good in the trees. Some of them are too torsionally stiff. That 144 Cool Bean is a little stiff to throw around even though it's the shortest of the bunch.