Y-Axis issues

Been fighting with this one ever since commissioning, X axis looks pretty decent but Y is just garbage and not too sure where to start looking. I've tried messing with the belt tensions, X/Y joiners and retightened every bolt on the toolhead yet but nothing has made any difference what so ever. Curious if anyone has seen similar?

VCore 4 400mm
resonances_y_2025-10-07-0634471.png
resonances_x_2025-10-07-0634371.png
belt-tension-resonances-2025-10-07-054836.png
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