v-minion Y issue

I think X looks quiet good, but Y is a bit strange to me. What could be the reason? I tried to tight all screws, used belt tension meter to adjust belt tension but graphs are still more or less the same...
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optimistic-gold
optimistic-gold•12mo ago
I am tunig it but Y still not good 😦 Here are my latest results. Any idea what should be the issue there? Many thanks for any tip.
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