Not only can you not prove that there is such a thing
as "regression" as you describe it, you can't prove
that any lowering of mite count is caused by
regression, instead of the other key factors: climate
and the presence of African Bees.

quotes:

Although the mite has caused severe losses of honeybee
colonies and has eliminated wild bee populations in
temperate climates, it does not appear to be a serious
pest in regions of the world where the Africanized
honey bees (AHB) exist. -- Spivak

Although reproduction of Varroa is
affected by the space between the developing
bee and cell wall, reducing cell sizes as
a mite control method will probably fail to
be effective since the bees are likely to respond
by rearing correspondingly smaller
bees  -- Martin






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