Sounds like you know what you are doing and are cautious. To me that is 2 important ingredients to handling these type of road conditions.
2 yrs ago I left Breckenridge CO heading East, I started to wonder if I would make it up to the Eisenhower Tunnel as we had some light snow and the tracks on I-70 were disappearing while pulling my 10,000 lb trailer. I never slipped once on the route and fortunately made it over the pass prior to the chain rule going into effect.
I also never try to use my brakes unless absolutely necessary in any vehicle on these type of roads. If you practice you would be surprised how effectively you can successfully do this. I also continuously adjust my cushion on vehicles in front of me especially when someone decides to pass me and utilize the cushion I created for myself, but on bad roads if you don't it will get you in trouble eventually. I am glad you made it safely.