I cook mine in the 275 degree range with no problems. If you took those off after only 3.5 hours with a pit temp of 200~220, they weren't done yet and the fat hadn't started rendering out yet most likely.
"VOTE FOR MOOSE!" Moose
Pit Beeatch for Team Munchkin
Avatar by Northwest BBQ
"If more people would just open their minds, more people would learn things." Wampus