RR 500 - Commissioning - Perimeter wobble above 80mm/s

Hi all, Losing my hair over this. Rat Rig 500 with carbon gantry and MGN9H. Hemera XS Extruder with Obxidian hardened nozzle printing CF-PETG and PETG. Battling a VFA-resonances and have currently: — Adjusted stepper voltage to manufacturer spec (helped a bit) — Checked all belt path meticulously incl. bearings and pulleys, runout, motor mounts — Tried all performance modes for steppers — Tightened hot end mount, linear rail screws — Checked for binding of rails and racking — Verified belt tension and ADXL-measurements The problem is a resonance which shows itself mostly in corners (using 5 sqv fyi) above 80 mm/s which is super slow. Above this there is something like a rough and bumpy vibration on turns. Currently I am investigating a very small play in the MGN9H carriage which due to losing a few balls had a rebuild with new balls. I am unsure if this could be the cause. However I have read that some carriage play is OK? Continuing this thread with developments and would really like your input. Thank you!!