I use mach to control the spindle now mate so thanks for that. It'll only work with M3 though because I've not wired the VFD for CCW and none of the cutter I have are CCW anyway. I'll have to take a look at the post I'm using and my toolpaths. I probably forgot to set Conventional milling or have the contour profile set in the wrong direction.

Are you saying leave G90.1/G91.1 out the code and set for it within Mach for most reliable results?