@: Op

Adjusting abilities would probably be the best method of action, but they would need to happen to PLD specific abilities to make a distinct difference between PLD and GLA.

Here are some thoughts or ideas.
Spirits Within- Add a Enmity spike bonus when comboing.
Holy Succor- Adding a major but short lived defense or stoneskin effect on target.
Divine Veil- Slowly Gain Enmity when Regen is cast on you or gain Enmity equal to the amount Cured when it's effect is proced.
Cover- Procure Enmity gained by the target players actions while in effect, or greatly increase defense while covering an ally.
Hollowed Ground- Instead of just an Enmity boost as someone suggested, all active targets become instantly enraged and focused on the player.

If I did take someone else's suggestion I do apologize, I didn't feel like reading 24 pages. XD