Slack is definitely a big issue, and we feel it potentially gets more "delicate" which you have plastic sprockets, which is one of the reasons that SprocketR exists - to find the right target for you. We believe like you that a tight chain is a good chain, and the industry seems to have some guidelines too.
Our percentage measurement isn't done, however, like these references suggest. We provide a slack relative to the overall length of chain. The 1% is our attempt at a useful slack that doesn't provide a loose chain that can jump. However, we don't have a bunch of empirical data...yet...that's one of the reasons we have the SprocketR out now! We'd like to use a bit of crowd-sourced testing.
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Also, when I choose 0% slack, it still gives me 3.598 slack (chain links) and tells me "Distance from Desired Slack (chain links)" is zero.
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Yikes, sounds like a bug. Can you provide us with information to duplicate it? We can take bug questions/data off of this forum and move it to
SprocketR@ChapResearch.com, however.
Thanks for the help! We want to make the SprocketR as useful as we can.
thats like having 24 young men going wild for 2 minutes - thats how much power is available during a match. - KenWittlief [more] 
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