You are correct - I do have 17" stock wheels with the all weather tires.
For the winters though, I didn't want another set of flaky 17 inchers

So the 16" factory rims actually worked out and makes the tires slightly cheaper too.
The speedometer error going from the stock 245/65/17 to the 225/75/16 is about 0.3-0.4mph until 90mph. So I think that should be good.
That being said though, Blizzaks are insanely expensive and my previous go-to snow tires, the General Altimax Arctic has creeped up in price significantly. Does anyone here have any experience with the Firestone Winterforce 2 tires? I know the original Winterforce tires were average, but the few reviews I read indicate that the Winterforce 2 are a significant upgrade?