If your remains are medium brown, then you're getting the proper heat.

The contents of the bag turn slightly gray like a spiderweb lost in a sudden gust but there is absolutely no visible vapor.
That makes no sense. If you're getting "contents" in your bag, it's vapor. If you think that vapor is as visible as smoke, you're wrong. A lot of the time you need to exhale in the proper lighting to see exhaled vapor.

As for not getting as high with vapor, vs. smoke, I responded to that aspect in your other thread about efficiency.
vapefiend Reviewed by vapefiend on . HerbalAire: Just Got It, Having Problems :( Hi! I've had to aromatherapy like three times more aroma than i normally therapy to get as therapied as i usually get :( The contents of the bag turn slightly gray like a spiderweb lost in a sudden gust but there is absolutely no visible vapor. :( I've tried 325f to 400f. Tried a little aroma, tried a lot of aroma. Tried whole aroma and tried ground. Tried bag and tried directly. If I burn this aroma I want to aromatherapy like incense, it therapies me just great. not so in this Rating: 5