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I modified my Chargriller Pro w SFB per some of the suggestions on this site - by raising the charcoal grate up with a Charbroil 17 inch adjustable.
I also tried the Best Choice lump charcoal from Price Chopper, also per a suggestion on this site.
I was able to maintain temps in the 220 to 240 range and got about 6 hrs out of a 10 lbs bag, adding about 2/3 chimney every 1.25 hours or so. Ambient temps were in the low 50s.