I had this issue on my Pit boss K24, I bought the kamado last March, and struggled from then until around this March, I tried everything, to no avail, and then a light bulb moment.
I did a 700f burnout, then a few days later I used my small weber chimney starter to light the lump, poured that onto unlit lump let the temp settle, and bingo No horrid smell.
I really cannot tell you how close I was to my wits end, I am a very patient person, and have thrown countless amounts of meat away, my better half had no interest in kamados whatsoever, after enjoying 10 years of really quite special Weber kettle food.
I hope this helps in some way.
All the best.