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No once you delegate you can only revoke. It's on loan for a better word. Your activity has no affect on your delegatee.

So, it would be better to use all my vote power down to just a few percent before delegating it?

I see no reason to power down unless you have over 100k steem power. 90 days is a long wait when you can just catch a trail and let them do the work. Keeps you with a steady steem supply. Being that I'm new now much sp but I get awarded about every day. Use my three. But this is my last free advice to you. When you post next add kmgroup as 5th tag to receive my support an help....if you want it. And I will take the time to explain how to play this game .....steemit. And maybe you will get free daily credit like me. NicePost out

Another thing keep power above 70 no more than 10 votes in a 24 period or you will hurt yourself.

My SP, after delegation, is about 50 and it is at $0.01 SBD for first few fully charged votes. After about 85% it goes down to $0.00 payout. I think the value of a vote changes globally so sometimes a vote from 50 SP at 100% will be $0.01 and other times it will be $0.00 for all the users. It appears to scale based on some parameters of the system.

Your SP is under 100 thats why. You should not be delegating if your under 10k there is no real short term benefit. Unless you want the right to say your delegating so why do it. Are you pumping a subaccount?

It is going to @minnowbooster I have been a bit busy recently with other projects.

I would say the number of Steem to power down at is completely relative to its' owner. 100K is huge amount for some and not that much for others. For some, even 100 STEEM is (relatively) a lot.

I am using MinnowBooster and earning about 0.9 SBD daily for the SP I delegate to them.