2018 Civic Coupe LX - Winter Tire Size Inquiry

I am replacing a set of 215/55 R16 winter tires that are mounted on steel rims (6.5x16" with 40mm offset). I would be buying the tires online and having a local shop mount them on my existing steel rims.

I am seeing some recommendations to run a slightly narrower winter tire for increased traction in snow/slush - such as 205/60 R16. Tires in that size also seem to be significantly cheaper for a set of 4. I've looked at various calculators showing a 1.6% increase in diameter which appears to be acceptable (below 3%).

Can I run 205/60? Or should I stick with the OEM 215/55? Perhaps there's another more optimal size?

I appreciate any insight/advice.