My favorite build for this is actually that which inspired you. Psi Warriors build in the right way are excellent for this purpose. The goal is to max out your HP and PP. Thus max your Wisdom and Con, take the feat that gives you hp for each psionic feat you have, and take the psionic feat that gives more PP. Once you have maxed your HP and PP, you use the empathic spells to transfer damage from allies to yourself, and from yourself to your enemies. If you happen to get hit you just have more hp to transfer.
