Protection from Earth Bless and Protection-Based Alteration-School Earth Buffs

[Immaculate]

Lets say you have a unit with fair but not great natural protection and it casts stoneskin or ironskin (forget the exact spell names but you know what i mean- alteration 2&3 earth-based alteration buffs). Then you bless them (or the other way around).

Are you loosing effiency on your bless? Should i choose a different type of bless (and use summon earthpower) for better efficiency?

Thanks,
i.