Hi, my school has acquired the same mill, and I had a similar problem to you, except I had a complete lack of a post processor. Shoot these guys an email:
cam.posts@autodesk.com they got me a post that I've had no problems with. I use fusion 360 for CAM, so the post they give you should work just fine. The master software doesn't really have any options for interpreting g-code, they stick by a strict selection of g-codes that makes it impossible for a generic fanuc post processor to be interpreted properly. Anyways, I got a reply from autodesk in a few days, and they're happy to make edits.