It has always been my belief that the tire/wheel combination on the CT is a good mix. As a general rule: Narrower tires are better in snow and on ice because they are more stable and get better linear traction by penetrating the snow. This is not true though; on hard-pack snow, wider tires with more sipes are better.
Again, manufactures must put on middle of the road tire and wheel combinations. I'm not sure the benefits will outweight the cost in doing this.
As for stepping down, the only downside to your car I can see (replacing all 4 tires/wheels) is that your speedometer would be off and would need to be recalibrated. You would also likely need a new spare tire too. Again, weigh the cost of the parts and labor for the minimal benefit.
2015 Acura TLX w/ADV
ASE Master Tech
CSI Vehicle Forensics
Last edited by Crashmaster; 10-22-2019 at 10:42 AM.