Everything I'm learning about the downdraft stoves emphasizes getting a good coal bed. I am without seasoned wood this first year and have been burning Envi-Blocks. But they don't actually burn down to a coal bed, there is literally nothing left of them but a fine ash. I didn't realize the difference until I just burned a few bundles of kiln dried hickory and oak and the difference in heat output was obvious and much longer duration. Any similar experiences/frustrations/success with the Envi-Blocks in a downdraft stove?