I'm new, and I know you guys have been through this 100 times. However, I'm doing some pulled pork on the egg for my daughter's birthday. I will be feeding about 40 people. I believe I read that an 8lb butt will yield around 4lbs of cooked meat. I figure generously, that 4 butts should take care of this. Does that seem correct? Also, as long as I have enough space between each but on my XL BGE, I shouldn't have to increase cooking time to do four, should I? Thanks in advance for your thoughts!