I am getting a "fuel-like flavor" off my med BGE when I really fire up the heat. I used wicked good charcoal (also other quality brands) and light with an electric lighter. I have had this grill since new and have never used any lighter fluid or starters ,other than BGE starters (quite a long time ago). It only seems to happen only with high heat (did pizza last night, around 600F). I keep it clean and have also burned it off in the past to try to burn off any residue. Any ideas???