Ah, I see I need to add stats: 160lbs, roughly 839 days riding
Seriously, the powder in Japan rides just like powder elsewhere. Yes, hokkers pow is crazy light, but it's still powder. It doesn't matter if you have a pointy nose or a blunt, snowboards all float. I'll say it again, if you're riding trees, the nug is the most amazing twin that floats like mad. I just got a 48 spliff and after 3 days on it, my k2 panoramic, which I rated as a good board, got relegated to the for sale block.
Fwiw, I have ridden the 61 ultra dream in pow & hardpack, and it's not bad. It didn't have more float than my 150 nug though. I find overall that I'm not a Big fan of k2's flat camber. It performs well but feels dead-ish to me