Are you using Royal Oak lump or the Royal Oak briquettes? Two different types of fuel from Royal Oak. I've never used the Royal Oak briquettes, so I don't know if they give off a slightly different scent while burning. The RO lump while burning, is fine to my taste palate. Never noticed a foul taste on my foods with the RO lump.
[FONT=Comic Sans MS]BDS - Deluxe 2343
Char-Griller Smokin' Pro
Cookshack Super Smoker 50
Exceptionally Accurate and Fast Red Thermapen