Hey Dallas, I'm using Addictive Drums and don't use the Metal kits but do have about 12 other adpaks.
I find them quite fine loudness-wise, the snare, kick, toms have a ton of punch. I do tend to turn up the kick and hi-hat settings for each kit I use as they feel low by default.
I wonder if your sensitivity settings on the module are too low. I would imagine if you get the punch/volume you are looking for through the module on its own, then AD ought to give you that powerful attack as well.
Keep us posted