Fog is mainly convection, so if you are used to conduction the vapor production is different, you need to take long and slow draws in order to get a good vapor production, quick fast hit does not work. Can I assume you get a lot best taste from the Fog than out the Hebe2?
Usually I start at 3 for 2-3mn and bump it at 4 for the rest of the first cycle. I power it again for a 2nd cycle at 4 for the first 2-3mn and 5 to get all the goodies out until the end of the cycle. It appears I rarely turn it on for a third cycle except if I got it filled with very high quality flowers, although, even if it's still producing vapor I agree the taste is very charred.
I already mentionned the Fog works better for me dry than through water, with a bubbler the vapor doesn't seems thick enough... maybe the bigger airflow overwhelmed the heater. Dry, I get consistent and satisfying hits imo!