I'm not going to mean for this to sound contrary and I hope it doesn't, but, if cooking for a crowd is it absolutely imperative to have the crunchy bark?
The reason I ask is that I smoke for a long time at a lower temp (I put meat on cold, at a cook temp of 215-225 and let it go until the butt hits 165, at which point I wrap in untreated brown butcher paper (maybe this is another reason I haven't bark problems?) flip upside down in a pan and turn the temp up to 250-275 and cook to 200 internal. I then let it sit in a cambro, still wrapped in grease-soaked paper, for at least an hour, typically longer. My reason for noting the above is that I still have great bark, it's just not quite crunchy. The best part about that is that it's soft and easier to break down into smaller pieces so that more of the bark is interspersed within the pulled pork. It seems to work fantastic, and I do this for competitions as well with good results. Just thought it worth asking about the bark.
Regardless, hope you get it all where ya like it...