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In this case waiting helped because I got to study what and who I was voting for before I went ahead and used my votes. Some witnesses were disengaged or otherwise inactive and these would have been wasted votes.

If I had just followed the above advise literally this would have been the case.
Now I know that I can see who is already in the top 20 that doesn't have my vote, I can then use strategy to either strengthen who's already there or bring up someone else who should be, or both.