Talent choice node between
@Calming Coalescence and
@Refreshment should be reworked on:
Calming Coalescence - The absorb amount of life cocoon is increased by 80%
When life cocon isn’t completely absorbed it refound 45 sec of its cooldown. It can not occur more than once every 120 sec
Refreshment - your life cocoon splits equal among 4 players(helaers=>dps=>tanks), they also gain 2 stack of healing elixir.
That would be proper cooldown, both in raid and mythic, and you could adapt both cocoon and sheilun to situation and your playstyle(better spothealing on AoE)