Tuning my 500mm Vcore for high speed

I specialize in electronics and not mechanical stuff so I'm a little bit lost here, even after watching some youtube. I don't really know how to interpret my own charts, so I was hoping to get some insight here. I think my belt tension is probably fine. The X Resonance has a spike around 125Hz that I haven't been able to smooth out despite tightening most things on the gantry. Is there anything obvious here that I'm missing?
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EEIN
EEIN4mo ago
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EEIN
EEIN4mo ago
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EEIN
EEIN4mo ago
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EEIN
EEIN4mo ago
this video is before I tightened the belts about 3 full turns:
EEIN
EEIN4mo ago
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EEIN
EEIN4mo ago
the charts reflect after i turned the belt tension screws. i hear a little extra noise on the y axis movement, but so believe that’s normal for CoreXY machines due to the extra mass in the Y direction