Interesting, but I'd like to point out that although your fight specific logs show that the RPR indeed out heals the tanks, that it is not a true metric when compared to overall tanks vs overall RPR.
This shows tanks out healing RPRs by roughly 1k on average
https://www.fflogs.com/zone/rankings...anks&boss=1059
If you're going to point out that WARs are just broken right now, here are PLD also out healing RPRs.
https://www.fflogs.com/zone/rankings...9&spec=Paladin
Granted, GNB and DRK average around 900~1k.
But if you compare RPR with other DPS, notably DNC, it certainly does look like Crest is overtuned. I suspect either DNC will get a buff or RPR will see a slight nerf, probably 100 -> 50 potency if I had to guess.