Re: Newspaper combine
Artur, as I recall, you made a vaporization device with what some suggested was a heater with too low of a wattage (not able to deliver adequate heat for proper vaporization).
If there are higher levels of varroa even after vaporization, it could be there is an issue with that vaporizer. If you have not done before & after varroa counts (sugar shake or alcohol wash) to confirm the effectiveness of that device, that may be part of the root cause of the hive weakness.
USDA Zone 7A Elevation 1400 ft