What has all the above got to do with the flat assertion that Canare are the best RCA connectors? I am not in the market for a phono stage. Your amplifiers would benefit from balanced phono drive, however.
Only thing: De-solder the plug, chop at that end to the desired length, and re-solder the plug exactly as it was. Don't chop in the middle. Not that you would necessarily do that, but... There would be an "ideal length" if and only if you are targeting a certain capacitance that you want to be added by virtue of cable length.
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