VC3-300

I tried to adjust the belt tension for the last hours, but somehow I can't get behind whats causing the first hump at around 50Hz in the belt tension.
The tension is pretty strong (much more than before mounting FMMM and new belts).
Also, the resonance on X is much higher than on Y.

Could you please help me interpret the problem? (at least I think there is a problem)
belt-tension-resonances-2024-04-01-181154.png
resonances_x_2024-04-01-181903.png
resonances_y_2024-04-01-181929.png
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