i did tons of sneakpulling and all sneak did was reduce aggro radius from back facing mobs. If the mobs were too close together, like the spell harmony, sneak pulling wouldnt work.
Source: Mained rogue and was good at sneak pulling for 7 years on live.
Based on some reading here:
http://www.thesafehouse.org/forums/s...ead.php?t=6563
sneak pulling only work to eliminate *aggro* radius like harmony but did NOTHING for *assist* radius, which some mobs have. This is why sneak pulling was inconsistant, especially in higher level zones.