Step 1: buy new tires (can't drive on snow with bald tires)
Step 2: buy a camber adjustment kit and get an alignment or failing that, at least rotate your tires at every oil change to even out the wear.

Raising the coilovers should reduce the camber which should result in reduced wear. Without known alignment settings, it is hard to determine how much your tire wear will change.

I think 17" tires in winter with any significant amount of snow will be problematic at best. I usually put on 14" snows in the winter due to the heaps of freezing rain and unplowed snow that I encounter.


Gordon.