OH................. yeah the TTB tire wear issue. It will drive a person insane. The geomerty of the TTB trucks wasn't that good even from the factory. Once you lift it the angles get worse even when the front end is in alignment.
Basically the angle that the tie rods are on is on a different axis than the axles and as the trucks suspension goes up and down the steering causes the tires to literally scuff from side to side since the steering is bolted to the spindle (or end of the axle). So as the suspension compresses going down the road the tires are are being pushed and pulled form side to side during this same movement. This is why TTB tires look like the lugs on a front tire look higher in the front of the lug than the back. Does that make any sense?
This article should help:
When you installed your lift did you do a drop pitman arm. This won't cure the problem but will help a little. Basically getting the steering in better line with the suspension.