I am starting this topic as a shaman player since many years.
Last turtle patch added coefs/scaling of melee AP into max ranks of shaman shock spells (Earth/Flame/Frost).
This is the description:
"This spell benefits from your melee Attack Power"
This addition caused major problems with PvP, which we're currently experiencing.
Enh tank focused shamans with pvp blue gear is critting Earth Shock around 1.1k, which is exactly the same value that Ele shaman could do with ~400 spell dmg (which means higher gear value or ilvls, or using flask of supreme power).
This case should be solved in favor of reducing spell dmg done by enh shaman in PvP.