Personally I kind of like the air shield bless, I don't think it's nearly as niche as some people do. Also, I still think the idea of a precision bless is too good for sacred mages and not useful enough to sacred troops. With a precision bless you would see lots of E/A blessed mages raining down highly accurate destruction and you would pay for it. Depending on what the other bless effect was on air you could also have fairly solid melee sacreds with such a bless (especially if it kept the air shield around).
And I don't see how a charge body bless is that niche, at least if you changed the shock resistance to work like the air shield bless currently does. Because it would be pretty useful of your sacreds to die and do armor negating damage to an enemy thug/sc. Even without the shock resist though it would be good for low armor/prot/survivability sacreds to ruin someone's day. For example, something like a battle vestal or jaguar warrior with w9/a9. This would work best if they kept the air shield bless though.
What if berserk was moved to blood instead of nature, and nature got something like 25% resist all elements? Or mr- (or maybe str...) negatable tangle vines when attacked in melee?

I don't know about the air bless, I'm reasonably happy with it personally. Though more for air shield than shock resist. Maybe it wouldn't be too bad if the 9 bless gave a minor mirror image?