Do you have your intakes raised i.e. with vertical pipe risers, or are they just nipples at the bottom of the drum? do you have pipe valves on all the intakes or just 1?
I added vertical pipes to the intakes on my drums because I thought it would save me the trouble of having to bend down to cap or uncap the nipples. Proved to be a not so great idea - struggled to get temps above 260 in the midi UDS and above 220 in the UDS. Also what is your deflector made of? if using a clay saucer the temps will drop alot right when you put in because the clay plate is cold.
I solved my problem by adding a 1 1/4" intake to both drums. When i want to go hot n fast I open the big intake as well as the others.
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