I built my UDS two years ago (love it), do not use water pan, but have been conteplating to get a diffuser not to keep the grease of the fire, but to difuse the heat more evenly (my fire box is rectangular). I do not soak my wood chunks, but if i use wood chips, i usually soak those.
No issues with fire/temp control. Love the cooker! You should definitely do it.
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