Three very simple, fast changes I propose:
1. Make Divine Healing, Divine Vitality, etc. SELF CASTABLE!!!!!!!
2. Add some tiers to the blasted things beyond tier three. Have you noticed Divine Vitality is maxed out at level 9? Level 9. That's why we all are griping about how much it stinks.
3. Now take Divine Might for example: FOUR tiers, maxed out at level 20. It IS self castable ONLY, and didn’t even come out for over two years after divine vitality/health came out—and probably should be (divine might) castable on others; then bingo, best buff, besides haste, in the game right there. You’re a level 20 cleric with 20 base Charisma? Here, you’ve made a lot of sacrifices for this thing. Now have a useful buff you can cast on someone else thereby making it something useful and worth taking for a pure cleric.
Fix these two simple things and it will do wonders to bring a tier two Radiant Servant beyond a Favored Soul WITHOUT a PRE, which, I for one feel, it is not in line with as detailed.