High peak at around 130Hz in belt tension with FMMM

Hi,
I've been searching for a while now and checked almost every part of the printer. I checked every part on the EVA and every idler bearing. The tolerances are fine, nothing is overtightened. Nothing is rattling except for the SSR in the Back on a DIN-Rail a bit.
At this point I'm really clueless what is causing this high peak.

I recently switched to the FMMM Mod and have Metal mounts for the front idlers too.

So in short:
Is the peak coming from vibrations or is something binding?
belt-tension-resonances-2023-06-29-112536.png
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