Wiggly lines! Can you identify my problem?

Not sure what I’m doing wrong but on a moderate speed (around 40/60) I’m experiencing wiggly lines. I’ve attached my machine options and also the extra options on the cut setting just to see if I’ve missed anything. It’s absolutely fine on lower speeds. The laser head is also stable and has no play and the gantry is good with all grub screws tight.

Images in Google drive folder

Let me know if you have any ideas!
Thanks A