Is it possible that your studded radial doesn't have a great snow tread? No question that the studs give you good traction on ice, but they wouldn't do anything in snow. OTOH there's a limit to the snow depth an Aveo can be ok with, even with the best snow tires. You mentioned 6-10", and I don't think an Aveo can handle anything close to 10". So if that's what you need to drive through regularly, then maybe you can find a way to get the extra clearance that you asked about. Wonder if Sidewinder cares to add his take on this, given that he lives in your region.