As it stands, we have very little uses for PVP power. From a PVP perspective, we only have 2 very important abilities worth considering; Inquisition and Templar's Verdict. Word of Glory is kind of out of the equation because it heals so little compared to Selfless Healer, but it still has its uses. But given these two spells that are vying for the same resources, you really need to ask yourself - is that all Ret paladins are capable of?
We need something else. Whats the point of retrofitting our class with Holy Power, but not properly giving us any abilities or utility to take advantage of our new resource. Something that you might want to think about when to use. Or something that simply doesn't have anything to do with us dealing damage, but more along the lines of group support and utility that's not on a horribly long cooldown.
Instead of keeping Inquisition as a core part of our rotation/Holy Power resource consumer, why not get rid of it and balance the spec around more flavorful and unique spells that do the Paladin class justice. Something true to being a defender of the light, defender of the innocent. We had a lot more of that going on in WOTLK across all three specs, and those were the best days for Paladins.