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The problem is getting the VP really low, my guess is at approximately the tax rate (1.2 SP)

So that means that with 12 sp, you might have trouble at 10-20% VP, but at 120 SP, you will be unlikely to make that problem happen manually. These are my guesses based on what I think I know - I have about 850 voting SP right now and voting 'as much as I want' plus some autovotes keeps me around 50% VP.

thank you I will have a play with it