I am not sure I have seen anyone do what I have done.
I just got a used 250 and have the first load of shoulders in there and I will duplicate what I have done in my hole pig roaster.
I started with that 15 years ago and over the years came to use a pan of water with vinegar and beer to keep the whole pig moist. You know how it is to keep the tenderloins from drying out while waiting on everything else to cook in a reasonable time which is 6 hours for me.
Another different element is cooking off the sauce in the roaster the last couple hours with the pig - naturally some dripping get in there and it seems to add a lot.
Now here is the trick I developed for shoulders cause it got to the point that 1 pig was not enough so I loaded up the bottom with shoulders in shallow pans. One thing lead to another until the shoulders would cook down with just some fat and water in the pan and I would throw the sauce right on that to cook off the last couple hours, pull the pork right in the sauce with rendering and people love it.
So I am trying the same thing in the 250. Also, I have two Remotes to check internals on two levels and surprised at the consistent difference in temp - maybe that vent hole is too big?
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