Have you tried recharging them as 2 single packs instead of a pair (if you have a lead that can do that) so that they are both equal then if your charger has the function of putting them as a pair into storage mode.
Leave a couple of days then try and balance chareg them again and see if they equalise.
Other thing to try is charging them at about 50% rate your would normally use and see if that helps
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