Jerry, I see that Chris has updated the BRITU recipe. Here is what he wrote (from the earlier version of the recipe on my computer):
"The recipe also calls for opening all bottom vents fully at the three hour mark, causing the cooker temp to run up into the 250–275*F range. THIS IS ONE POINT WHERE I DEVIATE FROM THE RECIPE. I find that it's easy to overcook the ribs if I use this higher temperature range, so I prefer to maintain my 238–240*F target temp instead."
My BRITUs turned out fine with not raising the temps, so I don't know any better, but heed his caution about overcooking when you do try it.
Let us know what you think of the higher temperatures.
Maybe Chris will chime in as to whether there was any noticeable improvement with the higher temps late in the cook. Crisper ribs?
Rita