I always set my bindings back on pow days. that's a no brainer to me. also, The T Rice banana hammock is no good at all on groomers. and even on pow days at resorts you're still going to be riding groomer runouts and flats. the banana hammock is pretty much only suitable for backcountry.
I'd look into any reverse camber rocker board. I have the lib skunk ape 165 with banana and mag. It's fantastic in the pow.
also know that you have to ride differently in pow. you have to really lean on that back leg and you should also get a bigger board for pow.