I took a slightly different route to try and even out temperatures, and I think it has worked well. I know because some people use the Weber lids and such, this may not work well. My drum lid did not have any bungs in it. I drilled eight 1/2" holes evenly spread across the top to even out airflow through the drum, rather than one exhaust drawing the heat to it.
Traeger Texas, UDSx2, Weber 22.5" OTS, Weber 26.5" OTG, Weber Performer Platinum Blue