At the moment, the epic Jidz-Tetka does give some substantial bonuses for certain builds (+8 ac for tanks, +1 exc wis for the wis based monk)
However, the signature feature of the Jidz isn't improved by an epic upgrade at all, meaning anyone who doesn't need AC or +1 exc wis but still wants the stance bonus will just leave it at normal (unless they want the slots, but it seems silly to grind an epic JUST for its slots).
I suggest adding a buff to the current version, to get Epic Tet-Zik, the Enlightened Change:
Fire - 35% insight bonus to Healing Amplification (10% greater than non-epic version)
Air - Reduces the Ki cost of the Monk's Abundant Step ability to 1 Ki per use (non-epic gives a fairly pointless +10 stacking bonus to jump, this buff fits the theme and is still useful)
Earth - Increases unarmed damage by two die steps, and gives 10% damage resistance. (non-epic gives 1 additional die step, that is useful but is hardly epic).
Water - Makes all unarmed vorpal attacks (natural 20 followed by a confirmation) inflict Epic Thri-Kreen venom: Paralysis, -2d6 dexterity, -4 Fort save. No save.
Any balancing suggestions would be welcome, damage on Water seems a bit much but most people in Water stance could use the extra DPS to compensate.
EDIT: adjusted abilities to take into account suggestions regarding balance.