No that makes no improvement for me.
I did another toolpath to show it a little better.
As is shown iin NCplot (white wireframe) is correct and in proportion. In Mach it is otherwise.
An interesting anomaly if you can see it is in the side view in Mach.
Look carefully and you can see the cuts paths are layed on their side. I don't know how better to explain it.
The basic problem is it should look exactly like the NCplot view but it doesn't and I don't know how to make it do so.
I am concluding, rightly or wrongly, that this is a bug in the Mach toolpath view.
I would love to be shown that I am just doing something silly.
Greg