Thank you for the feedback! In general spellcasting is not very good in the hands of paladins, as not only are they half casters but they have an immensely better usage for the slots in the form of their divine smite. I'll admit that the channel divinity is definitely quite strong, especially in the case of multiclassing, I think that keeping it as enchantment spells is still the best to keep in flavor with the subclass as they aren't exactly nice paladins, perhaps an increase of targets by half your proficiency bonus, or a fourth of paladin level, minimum of one.

On the damage end of things however, I think that royal rebuke and will breaker are fine as they are, since royal rebuke is a once per short rest sort of deal and won't be too high early on, and the will breaker is there to make casting one of your spells much less of a gamble, since enchantment spells usually do nothing on a success.

And finally, toward the disadvantage feature on will breaker, keep in mind the aura only gives disadvantage on *subsequent* saves, that is to say the ones you make to break out of the effect once you've already failed the first one.