VC4 400: Second peak not appearing

Hey, first time tuning belts on a coreXY. Not sure why the second peak is not appearing. @miklschmidt suggested before that my belt tension is too high, but I matched both belts on the one peak I have and reached low end of 1e6. Is it still too high, or can there be another explanation for this issue? There might be some noise due to the fact I didn't finish cable management on the toolhead yet, but I reckon it doesn't influence the general look of the graph. Thanks!
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