Layer Shifts when Printing (VCore 4 - IDEX 400 - Single tool mode)

I've been having this problem on and off for the entire life of the printer, but i recently moved the printer, since which the problem has been consistent - every layer will shift towards the front left.

Given that i've moved the printer, i'm working through the Commissioning / Calibration again, in a hope that working through all of this will help isolate the issue, as at the moment i've lost faith in the printer, as seems to work fine until i print.

Anyway stage 1 ive tensionsed the belts, calibrated Z and the Z-Tilt, and gantry. I've now measured the relative belt tensions using the macros but the graphs look a bit strange compared to what the guide suggests I should expect.

The graphs seem to suggest problems with opposite belts (if i'm understanding them correctly) so not sure what to try ?
x_tension_comparison_2025-11-23-091333.png
y_tension_comparison_2025-11-23-091355.png
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