Possible Solution to Protect

[Aeducan]

WHM is my PvP job of choice and I personally love how protect works there. It's a great utility (essentially The Bole sans the RNG) and syncs pretty well with other WHM spells. I'd rather have this version of protect and keep Benison's effect as is, because shield generation based on heal % is kinda stepping on SCH and nocturnal's specialty. Moreover, given how WHM has the highest raw healing potential, the shield might turn out to be even stronger than SCH/noct's. However, I do agree with you that current version of protect needs a rework and preferably WHM exclusive cause Nymeia knows WHM has the least spells among healers by a pretty wide margin.

Working on your idea, here's what I propose:

Protect
WHM exclusive, OGCD ability. Reduce damage by 20% for 10s. I'm not a pro on theory-crafting so can't say how long the CD must be before it's considered balanced. Perhaps 40s? Preferably acquired before lv 50.

Benison
Same effect, but only costs 1 lily instead of all of em. I'd be careful with aoe benison because again, it steps into SCH/nocturnal territory. If they stack with galvanize/noct, TBN, and other tank shield stuffs, then WHM would have a guaranteed healer slot cause that'd be too good.

Just my 2 cents on the matter