Looking at all the various horrible changes that hit the PTR and given the nature of them it appears we will be pushed to using this 6pc.
Which being said the system can appeal to some players but not all and if so the following changes should be considered.
4pc: Divine Storm now does Holy damage as well.
6pc: Effect lasts longer or the abilities affected by it have a chance to not consume the Holy Power and have their CD reset.
Beyond that other set bonuses that playstyles rely on have been harshly impacted in the PTR notably the t2 4pc effect. Nerfs like that affect the gameplay in a negative drastic way.
Its one thing to want to adjust number’s but its another when you remove the flow and feel of an entire build.