Sort:  

no curation at all if you edit, or less curation if you voted less at first?

It's no curation at all if you change vote.

damn, I didn't know this! It's good that I didn't edit too many votes hahah, but I can't say I didn't edit some to "increase my curation" and definitely hijacked my own rewards by doing so. Thanks for the clarification.

This doesn't de-penalize that. When you vote and unvote, you don't get your vote power back.

This was a different issue: once you vote on a post, unvote, then revote, your revote didn't give you any curation rewards. It is strange and unexpected behavior.