I have and used 4-5 (Cayenne, Jalapeno, Habanero, NM Red, Ghost) different dry powdered peppers, what I have found is with many the powders do not carry the flavor in the bite as well as using fresh peppers diced small.
are you looking for a hint of flavor? or are you looking to get smacked in the forehead? when you are done. I generally use 2TBL of the powder for 5lbs
and if I am needing more punch I add fresh as well. even adding the powder to the initial liquid solution we find you get to a point where the powder flavors/taste are all you will get and turns flat .
This Is Just My Opionion.
Keep On Smokin,