I have to wonder if you've ever tried it , given that you stopped learning 30 yrs ago when you decided there was nothing left to learn. I mean why would you when you find trickling perfect?
About half of my colonies will show no audible response at all to vaping and those that do are usually disturbed by my preparation to vape rather than the acid itself. Those with mites then go on to show more of a response than others for sure, but the claim that vaping causes.little or no disturbance is not an unreasonable one.
You mention that your winter bees last 8 months , have you ever marked bees to test that, or opened hives through winter to see what brood is present throughout?
Studies that have tested it showed a total colony turnover of about 3 months. Even in your climate I find the idea of an 8 month broodless period doubtful, especially given your predilection for a race of bees that seem far less capable of producing the fat bodies required for winter longevity.