You are misunderstanding what makes the bracers so OP - is not having two swiftmends. It's the fact that the bracers give you 10 extra seconds of cenarian ward, which is OP AF. Even without the bracers your go to build for mythic raiding should be ward and cultivation. Cultivation is insane. If you try cultivation in heroic do not be misguided as it will heal less in fights where people do not dip below 60% (heroic) but rest assured in mythic it will blow your heals out of the water. It's another free hot to interact with your mastery on targets that NEED healed, so it's perfect and it's low overheal (unlike prosperity and soft which can result in a lot of WG overheal).
As for inner peace or spring blossom. I almost always take inner peace and hate spring blossom. But for me on this fight spring blossom was INSANELY powerful as you keep mushroom up on the same spot the entire time and it's always throwing the extra hot on people.
I only have two kills, one with inner peace and one with blossom. Granted the inner peace one I did poorly for a variety of reasons. I also could have tranqed an additional time. But, for both pulls tranq did ~ 39 mill. Spring blossom did 11 mill healing. I ranked 90th percentile with blossom, 37th with inner peace (but again I did bad that pull for other reasons as well). And the two people above who posted inner peace logs both have less tranq healing than my tranqs with spring blossom, whic to me says the extra tranq is mostly overheal/unneeded and blossom is best.
My logs:
https://www.warcraftlogs.com/ranking...873&metric=hps
Even without inner peace you can still have tranq up for both 8 blob explosions. I didn't really see any other huge damage moment so inpreferred having the consistent walks of spring blossom. Both are great.
Moral of this post - take ward and cult. I prefer spring blossom but inner peace is always OP (but I recommend blossom).
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Also resto druid is awesome on this fight, I don't have problems competing for the top. I was the top healer for both our kills, competing against a holy priest, holy pally, mistweaver, and resto shaman.
Also as someone else mentioned if you have any healers doing more than 350k your team is taking unnecessary damage and you are likely stacking the blob dots when you need to let them run out before killing the next.