A kind of rule of thumb, in my part of the world, is if mites are in 25% of drone larvae, then you treat.
But there's no absolutes. For one thing, if it's early spring and not a lot of drone larvae yet, then you would naturally expect the mites to be focussing on just a few larvae.
Other thing, no form of mite counting gives you the associated virus levels, and it can be those that do the damage.
My opinion on your situation Kim, it's unlikely your mite levels are at a "need to treat" threshold yet. But, might, or might not, be getting up there.
If the history of your bees is they are a non mite resistant strain, you could get that level of security, by treating now. If you are willing to take the risk, you could not treat, which would be a crapshoot, could go either way.
44 years, been commercial, outfits up to 4000 hives, now 120 hives and 200 nucs as a hobby, selling bees. T (mostly).