@lewm
The plan was to experiment first with the smallest change to down force. Then see if that, combined with a small change in VTA did the trick. If these small adjustments didn’t solve the issue then I was to send the cart in for evaluation.
-0.2g was just enough to do the trick but the VTA increase made the rake angle look a bit better.
so to try and answer your question, I guess downforce.
CORRECTION: the VTA adjustment was 2 playing cards so more like +0.5mm NOT 2mm