Butt Wrapped?

I tried foil wrapping a few times to speed up the cook. It did work, with the butts finishing in 5 hours after 2.5 in the foil. However, the results from my attempts were both greasier and somewhat less tender than butts just done slow.

If I understand you correctly, you're smoking them as if they were one big roast. If your egg's big enough, don't let them touch each other while smoking, and they should be finished much faster, and hense better bark.