Help with the resonance on x

Standart vcore 3.1. Had the FMMM mod installed some time ago. This is my result. I have tightened everything down, belts are kinda straight. But my X axis is just wild. I had much better results when i just assembled the printer. It was ideal. Now its a mess. Y is okay, but still there is a second big hump and i could not identify. Oh, and previously X axis had only 1 hump at 74 ish hz. There was no vibration on 125