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We can't really make an impact as all of the top 20+ witnesses have this soft fork running, except two.

well, then I'll vote for 30 that do not run it... :D

I don't vote as a rule for Top 20 witnesses, except a few (two of them run the old unforked version of Steem), unless necessary.

Otherwise I prefer to distribute my vote to backup witnesses, usually in top 50.