Vcore 4 400

I'm tuning the core XY belts on my Vcore 400. The first peak amplitude is lower than other graphs I've seen. I did correct the gear heights and it helped a little. Is this graph acceptable or is there some other cause of low amplitude at 50 ish Hz?

Thanks for any advice.
belt-tension-resonances-2024-08-07-022405.png
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