Well, again getting back to "balancing" the cleric vs mage. When I kill using whatever skill in Atrinik it "boils down" to how many "mobs per hour" of a certain level can be killed, which equates to "exp per hour". When defending the calculation is similar - how much time is spent "hiding"; praying; or otherwise not engaged in murdering which affects the "exp per hour".
In Atrinik (the way the dungeons are designed) the mobs in high level dungeons often have enhanced powers. I think that this effectively counter-balances the arguments that players with level-related skills are "too powerful at high level" - indeed, its a challenge to the map-maker to create this fine balance. But overall the game is based on AD&D "rules" (and there are a set of the TSR manuals in this study) which have been tried and tested for decades - in those rules level is paramount.
"Too weak at low level" to me indicates a design fault - either simply raise the level requirement or "jig" the increment per level!
So in summary I suggest sticking to level-dependant effects.
btw I don't think I will be using the consecrate prayer until you tell me to!
Hoping this helps
(and be quick with that map Ghost)