This article over on a pathfinder forum really helped me understand the T-Bar's operation:

http://www.nissanpathfinders.net/forum/index.php?/topic/17038-how-to-re-index-your-torsion-bars/

Looks like my T-Bars are definitely rust welded to the anchors, hopefully i'll be able to adjust them enough without having to completely remove them as the write up suggests.

Thanks for the help here again! I'll be doing some adjusting soon!

**Edit**

Finally had a chance to fully read through that write-up. Looks like I actually did re-index the T-bars correctly via the front anchor, but didn't tighten the rear anchor nut enough to apply appropriate pressure to the T-bar.