James, the only other thing I could think of is, clean & grease up the front AND rear driveshaft slip-yokes. These *telescoping* driveshafts and chassis flex are the ONLY things there to help absorb drive-line bind. The driveshafts have to be dropped to do this, but it is easy as they are flanged/bolted at both ends of both shafts.
G/luck
Joel