I take your point, everyone using sublimation should be familiar with the requirements and use of personal protection, if not don't use it. The sucrose method is very nearly foolproof, although someone will leave it in an unmarked vessel and someone else will drink it.
All the articles I've read fail to show any consistent difference in effectiveness.
If you treat 2 weeks later and there is second small peak then it has killed more mites, which could be due to any number things from operator failure to brood in the chamber