If you have 50 HP staked and you stake 50 HIVE, you are getting double the VESTS. Because the voting power depends on the used VESTS, you get 50% in this case.
If you powered up…
Using Keychain to swap might be the easiest, yes. Assuming you have android because otherwise you would not be able to swap on a phone.
If you are on PC, use the to swap…
Yep, but if you power up, it gets restored immediately (proportionally to how much you power up).
So if you are 0% Voting power, and you are 50 HP, if you power up 50 HIVE, you…