How many intakes do you have open? I use RO lump in my UDS with no problems. I have three 3/4 holes that I cover with magnets. Depending on the outside temp, I go from having 1 hole 1/4 open 2 others closed to having 2+ open on cold days and I can hold it at 250. I use a Weber lid, exhaust always wide open.
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Bill
Red Performer 1993
Green Performer 1998
22.5 OTG
22.5 OTS
UDS
Super Fast Red Thermapen 
Got butt ? Smoke it !!
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