IDEX inconcistent nozzle alignment

Starting a thread about this issue. Posting graphs below.

Issues:
VAOC issues, nozzles doesn't go back to the saved position and during print they don't align well, offset in x, y is perfect.

Having hard time with the belts. Mainly t0 looks good but having problem getting t1 at same frequency and also the belt tension seems to vary along y.

Feels like t1 need higher tension than t0

VC4-400