New psionic power feat:
Beguiling Torment. Whenever you daze an enemy with a psionic power, you can slide it 1 square for 1pp.
Since powers inherit all the triggered slides (see mark of storm+staggering weapon working, etc.), Staggering Weapon/Hindering Shield should work with this slide:
Stygian Adept for 2 more pp/Fleeing Fear
Staggering Weapon (Hammer) +6
Topaz Crusader Epic Destiny for 2 more pp
Hit the target. It slides from Fleeing Fear and is slowed (HS) and therefore dazed (OI), triggering Beguiling Torment. Slide w/beguiling torment, which slows the mob, which dazes it again, triggering Beguiling Torment again. You can do this as many times as you have power points.
Total squares of slide = 8 initial (Stygian Adept) + 8*19 (Beguiling Torment) = 160.
Note that you could also conserve pps and "only" slide 56 squares 3 times =)