As stated, you can fill the whole bottom bowl up with charcoal and just use the vent and daisy wheel to keep it regulated.
On a side note, the only people I've ever known to be displeased with their BGE all had the XL size. That may just be coincidence.
"When there was no fowl, we ate crawdad, when there was no crawdad, we ate sand."
"YOU ATE SAND!" - Raising Arizona
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