Not sure if this would be an option for your 550: I'm using a 72" KFI plow on my Hisun Sector 750 - works well. Driveway is 350'+ x 12'. One pass down the middle and then one on either side. (photo is UTV with plow at the dealer's - was delivered that way). Note - need to manually adjust plow angle.
Once it gets a little below zero F, the snow lightens up. More of just frozen humidity hanging in the air like a frozen fog.
At 1120 hours my local temp is way up, its now 5 F with a good NNW breeze. Looking to warm into the mid 20s by week's end.