There are some quality natural briquettes on the market. My Mini WSM (sjs) does not like lump at all. I used a full chimney of Kingsford Blue to cook two Oryx Fatty's last eve, had plenty of run time remaining. Tried lump twice and it was a PITA.
Primo XL, Pit Barrel Cooker, Tiernan SOB, Mini WSM, Big Green Egg Mini via Craigslist, 5 others, Black Thermapen