Don't chuck your Gyrator. The Nug is pretty rad on powder days but has it's limits. I got one last season and had the same notes as you on the reduced stability (esp. comparing to a Riders Choice). In addition, the board struggles with wet heavy cascade cement. You will want your other board for Spring dumps and anything super deep. Super fun on slushy bluebird days though.
Nug is an awesome change of pace.
Yeah, i'm pretty curious about riding it in the heavy stuff. The gyrator will plow through anything. Its a beast. I'll definitely give it a shot on the nug. I think its going to be weird riding a 162 though. My smaller boards are 152 and 154. 162 is going to be huge.
Are you still riding the nug this year?