I'd suggest gettin' another Taylor probe,if you have to experiment.
Put the probe through a tennis ball sized hunk o' foil and place it on the rack closest to your temp probe,with the tip not touching metal.
Shove as much wood o' choice ,as the box will hold.
Set the dial at 235º and close it up,turn it on.
Go in the house and get the three,seven lb bonein butts, that you picked up today.
Put more rub on them than you think makes sense,and a heavy coat of Turbinado sugar.
Mash them as flat as you can mash them,and set back in the refrigerator.
Prep the family dinner and go ahead and eat,if you wish.
Clean up the kitchen and take the butts out to the cooker.
Probably be about 8 PM?
Don't waste time lookin' at the therm.
Find a way to get the butts on three racks.
Bottom one, could be fat side down.
You could put the other therm probe, in the smallest butt.
Now you could hire a neighbor kid to sit in a lawn chair and check the temps every hour and record them on a yellow pad.
Watch some TV and go to sleep.
About 9 AM go out and look at the therm readin'.
If it is about 190º,open the door and twist the bone.
If it don't twist,use your instatherm to check temps in several places.
If it isn't ready,close it back up for at least an hour.
Try again.
Should be ready.
If you fall asleep in the lawn chair and it goes to 200º,probably won't hurt it too much.
Get the yellow pad from the neighbor kid,ignore it, and throw it away.
Foil and cooler the butts a few hrs,until ready to pull and eat.
Just my $0.02 worth,and we all know how that can fare.
