so is the print starting for a few layers and then the z axis goes into reverse - or does the z axis just not drop.

I did some research and I found out when I slice with Simplyfi3D and save the G-code on the external SD card all is fine
So why not just do that ?

I mean if doing it one way means it works and doing it another way means it does not work - then don't do it the way that doesn't work.

What do you expect to gain by using the method that doesn't work - ie: why persevere with it ?