One of the questions that Dr F is studying, is whether the dry-burn taste occurs before or after the noxious chemicals are produced. I think I can taste anything that might be bad, but that's not proven yet. Until it is, the absence of a dry-burn taste is not proof of anything.
I just dealt with that earlier. I've got a rather high wattage build on a mech, and have been plagued by an off-taste with a fresh battery (10-20 hits, approximately). Rather than vaping through it like I have for a few days, I decided to re-wick and attempt to diagnose what's happening. The wick was in almost perfect condition; minimal discoloration even at the coil, a slight bit around the edges.
Thankfully the re-wick has done the job, I'll have to see how it holds up. But anyway, that leads me to believe that the off-taste comes before the serious nasties, or is perceptible at the slightest levels (like how some of us can detect Geosmin, associated with the smell of rainfall, in concentrations as little as 5 parts per trillion).
We shall indeed see, hopefully soon enough