1st Cut

[Jonathan]

I suppose both X and Y are incorrect so will adjust these when I am next in France where the machine is.

No, if you flip both the X and Y it will still be mirrored! To find the correct axis directions you use the right hand rule - thumb is X axis, first finger Y, second finger Z.

This explains it:
http://www.cncexpo.com/Cartesian.aspx

Feed rate was quite a funny thing. X and Y were originally set to 5 so I ramped this up to 120 for this cut.

That is 5mm/min and 120mm/min, not ipm? If it's in mm/min that's really slow. I would expect a small machine like that to do 2000mm/min. Maybe your acceleration is set to high?

Actually, just looked at the video again, you used the override to get 180mm/min. Near the beginning of the Gcode there will be 'F120', try making it say F1000 then start the machine with the override set to 10%. That way you can gradually increase it and see what happens. With a 6mm cutter and 1.5mm depth of cut on a good machine you can run it at 10,000mm/min without breaking the cutter. So don't be worried about breaking it.