I still feel that all supports are under power in some situations. I would like to advise changes as follow:
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Support passive buff to 25 HP/s.
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All support buff to 225 HP like Zenyatta, E.g. 175 health + 50 shield or 175 health + 50 armor.
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Remove some strange change like Mercy super jump (Zenyatta is fine) and change her passive to prevent 50% head shot damage.