I might do a 3 cycle sugar thing (1 week apart) to encourage them to get rid of the bulk of mites before cold weather.
That trick is humbug. It has been verified that it does not work. 80% of mites are under brood cappings. No stuff affect on them.
In warm climates where there is no brood brake, mite treatment is difficult.
One way is take frood frames away, if they are only couple. Then give oxalic acid trickling and you get very good results.
But even if there are brood brake, trickling does not work alone. You need thymol or formic acid treatment before autrumn that winter bees are not violated by mites.
Then you have Beatles method: Let It Be
I try. Mites won't let me. Hi Finski.