Without touching the Royal Oak vs BGE there could be a lot of factors that can contribute. I would think that the finished lump would go through some form of shaker or vibrator equipment to get rid of the ash. If it didn't lump would be white or grey. If it's not shaken as long there would be more dust.There is also the amount of time it spends in the reduced oxygen environment and how thoroughly carbonized it is. I would think the wood itself would have to be "seasoned" to eliminate some of the moisture content. Maybe some use "greener" wood than others. This is from someone who knows nothing about the production. Transportation and handling could affect the quality as well. I can tell you that Maple Leaf does not spit when I light it with a map torch and RO does like crazy. This even though Maple Leaf comes from a foreign country. I would like to hear from St. Louis Charcoal on this though.