It is okay that you (FC) put in some not so nice ability's to mobs / raids. Not nice to see the ncu empty o.O but okay a new challenge
But do you real think, that it is okay to kill the Keeper Auras? The only profession that need real a very long time to buff up and is not able to run like most other profession to buff up.
How about to give the ncu remover nano a additional part like:
if prof Keeper
Block cycle of aura's xyz for 2 Minutes or something like that. (Time depends on the other profs need time to self buff them after getting ncu whipe from the raid, but this sort of balance is a part of you FC )
So the Keeper is "debuffed" like the other professions but after the time the Auras start to work as normal.
Which Keeper would like to buff up like hell to lose in the next raid his buffs, while the other player mostly instant recasting them.
Hope I was able to give you another point of view of this ncu whipe debuff for player.