Re: coal headaches...
I rotate between coals and use the CH quicklights sometimes when i'm inpatient to get naturals going. I never get headaches from them, they burn hot, and leaves no taste. However they smoke alot, so either light them outside or light them to flame up, rids of the smoke. Also they ash alot, just be prepared.
Have you tried shisaco coals, they are like coconaras but they ash a considerably more. But at a cheaper price and get buy one get one free, you can't complain.