[M_a_t_t]

I don't know if this is an option for you right now, but what I currently do is I drive my car (the mercury) when the roads are clear and there is no forecasted snow/ice. If there is I drive my van. If having 2 vehicles is an option, now or eventually, you won't have to worry about snow and aero mods.

I can get a decent amount of snow where I am, but not as much as you describe. I won't be able to be much more help.

Good luck with it.