Hi Swol, thanks for your swift reply.
I do concur that one ring should not result in such a large increase, I would’ve perhaps not even expected such an increase to even go from no ring to either of these rings. Both this result and the BiB results confuse me, hence the post!
I didn’t save the sims, but I’ve re-run them. As far as I can tell I’ve kept everything the same apart from the ring.
Run using Entwined Gorger Tendril w/ +12 mastery enchant (ilvl 171): Simulation - Report (askmrrobot.com)
Run using Bloodoath Signet w/ +16 haste enchant (ilevel 187): Simulation - Report (askmrrobot.com)
I do get what you’re saying re stats, but does make me question the AMR stat weights when all the top parses on warcraftlogs of disc priests are stacking haste first and that also seems to be the general consensus best secondary stat.