I have no idea why but conduction kills my lungs. Like getting a cough that stays with me for long periods of time. I cough after every single hit. As soon as I use my convection style vapes the cough goes away. I think a lot of people have a total different experience.
I know what you are talking about, conduction vapor seems to hit my throat and lungs a little harsher. That said, I can do mouth to lung hits witch thick conduction vapor which I have trouble doing with convection vapor. I also find convection vapor dries out my airpath more than conduction.
That's why I like a balance. With heavy convection I have to sip water to stop from having dry airways. With heavy conduction I end up coughing up a lung.
The new vapcap tips are a pretty good balance to me. Same with the arizer portables.
The biggest problem with conduction is that the taste degrades quicker, but I like my vaporizers to kill the load in 1 or 2 hits, so this is not an issue.