I understand what you're talking about, I ride a 2010 NS Evo (stiffer than the newer models) primarily in powder/trees and it's so much fun because it's extremely responsive. It takes a little more skill and effort because it's not designed for powder, but with the rocker it does well enough. I do use a slight setback though, about 3/4 in. It's enough to get my weight on the back and keep the front popped - without it you definitely bog in deeper stuff.
Maybe take a look at the NS Proto, it's stiffer than the Evo but still plenty playful.
PowderHound and TreeNinja