There is not much more you can do. Apparently, a variety of bacteria can develop on damp weed with each genus capable of causing harm, if the conditions are met. Many are deadly and some will just cost you a trip to the hospital, and few actually improve the quality of the cannabis hence some smoker's desire to store weed for increased potency. Watch where you store it though! You might be looking to increase the potency of your stash, and end up finding Aspergillus fumagatis instead.