I know I run mine at 9.5 on the dial it came with. Anything less than 9 (maybe 8.5 at bare minimum) doesn't produce worthwhile vapor for me. But, at what I run it at, it's fantastic. Nothing's getting burnt at that temperature though, and the flavor is fantastic (no dreaded popcorny/toasty taste). I will admit, I was a bit annoyed when I first tried it at 6.5 - 7.5 like many here recommended, and didn't get barely any vapor. Mine is gravy though at 9 - 9.5 out of 10 on the dial, and I get full even extractions (completely even color from top to bottom of the bowl as well). Hell, I use it dry at that temp, and it doesn't get harsh. I use the same temp when using with water. I'm completely stupefied as to what may have happened with your experience.