Hmmmmm.....wierd.
I guess I should update my technique, as it has changed since I last wrote in this thread. I still only use the direct inhale method, straight from the mouthpiece, not using the extension. I fill the crucible half full. I turn up my heat to 365. Once the yellow light comes on, I begin. I inhale very slowly. The first hit is usually no vapor, just taste. The next 5 - 7 hits are vaporlicious!
It sounds odd that you're seeing no vapor but your remains are toasted. Maybe you have a defective unit?
I grind my herbs. I know it says not to but I find I get better vapor with grinding.
I find it takes me about 10 - 15 mins from start to finish.
I've been smoking for 10 years and 1 year of vaping and I'm baked after a session.
Maybe it's the quality of your herb?