I can relate to this. I have been using Exotica coals for 6 months or so. Before that I used mostly QL's Golden 33mm and Pharaoh's Elites mainly. I ran out of Exoticas in the box I have in my smoking area and was too lazy to cut and break a new box so i grabbed a QL.
It took awhile longer for the coal to catch then I remember. After the coal ashed over I put it on the bowl and took a couple of pulls and it tasted nasty. You really don't know how nasty a QL tastes until you switch from using naturals for awhile. I'll never ever use a QL again.