Also check the rear shackle angle. With more arch the rear springs may have pulled the rear shackle forward so it works against the springs when they try to flex. Lots of info on Naxja.org. here's a representative thread:
http://www.naxja.org/forum/showthread.php?t=101028
People either relocate the shackle mount point some how or remove a few leaves to allow the pack to flatten out and then compensate for the lower height with a longer shackle (1.5) or replacing the spring mount with a u-bolt eliminator (basically slightly a taller spring mount.)
http://www.naxja.org/forum/showthread.php?t=101028
People either relocate the shackle mount point some how or remove a few leaves to allow the pack to flatten out and then compensate for the lower height with a longer shackle (1.5) or replacing the spring mount with a u-bolt eliminator (basically slightly a taller spring mount.)