You can have a ball on any board but sooner or later you are going to want a directional powder board in hokkaido. Might aswell make it sooner rather than later.
First year I went with a ns sl 164(massive fail) and a sierra rc 159 which floated way better than the sl but still wasnt enough.
Second year I did the DIY swallowtail on my 172 supermodel and things started getting better.
Third year I built my own swallowtail 180 and it killed it, as did the 180 birdman.
This yeah I have a few different shapes, a super wide 180 with only 10mm taper and a 170 with 40mm taper. Also a 164 split to keep the weight down and the birdman tagged along too.
I recommend you go bigger than you would normally ride, just cause its so deep out there. More important than the actual size is the rocker profile in the nose and very few boards have it right for pow like that.