>you have done other things though. you raise your own queens, and have kept only hives that could survive without treatment.
I didn't lose any to Varroa from when I regressed. I was not raising my own queens at that time.
> perhaps your overall approach is more the reason than small cell?
I'm sure the overall approach is important in the long run. It was not what I did before my Varroa problem was resolved. All I did before that was regress. I'm sure raising acclimatize bees greatly increases survival, but not from Varroa, from climate, and seasons and flows and dearths and cold spells.