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Depends on your "already" staked HP and how much mana you have used from that HP.

That's true. Gained % of voting mana from the newly staked HIVE depends on 3 factors if I'm not mistaken.
Current HP, used mana and amount of newly staked HIVE.

Actually not too difficult to calculate, just not something I thought about before πŸ˜„
!BBH

Correct! You got it. 😎