I have heard of folks using 1/2 dose of Formic (Pro?) in the heat to lower the impact on the colony in high temps. But I have not tried that, proceed with caution.

You can also use multiple OA treatments.

I have some formic pro and some hopguard if you would like to try some. I Also have a proper vaporizer. I assume you have already pulled your honey?

Treating for mites is difficult, there is no silver bullet. What you need is a pest managment program. You need to find a strategy that works with your way of bee keeping. Most beeKs are using a combination of treatments over the year including brood breaks to slow down the mite.

I have not found a central source for info on the different treatments available.

What is MAQS?  edit  Mite Away Quick Strips