Mr. Griggs, sounds like you are having fun with the bees. Also sounds like you have dwarf wing virus which is transmitted by varroa, very common in the South, not your fault. I am leary of mite treatments except for oxalic acid because I consume, extract my honey.
I would be very concerned about a treatment that can penetrate wax such as Formic acid. Consider miteacides may affect your queen. I have studied in detail Oxalic Acid from PubMed:
Journal of Apiculture Research, volume 54, issue 2, 2015. TOWARDS INTEGRATED CONTROL OF VARROA: COMPARING APPLICATION METHODS AND DOSES OF OXALIC ACID IN THE MORATALITY OF PHOTETIC VARROA DESTRECTOR MITES AND THEIR HONEY BEE HOST.
This is a detailed scientific study, 32 pages, 18 months of data to determine long term effects of oxalic acid on bees with emphasis on queen procuction of eggs. The detail is mind boggling to the extent the scientists built special traps to collect any dead bees carried off by nurse bees. These guys know their stuff and considered everything.
Oxalic acid improved egg production 1 year later when the acid is correctly applied. The reason is postulated varroa elimination improves overall health of the colony as determined in long detailed studies.
I have not acquired scientific bonafied knowledge of detrimental effects of Oxalic acid on honey bees with constant timely searches of PubMed. These detailed studies are not readily available with google searches, one must utilize PubMed.
I am void of bias but very skeptical when I ascertain bonafied scientific articles. I cannot count the pages I have studied on honey bee health, both opinions based on nothing more than bias and bonafied information with impressive attention to detail.
I would like to add thanks to Cao and others for detail corrections to my past post.
Blessings