Trouble getting my frame squared (V-Core 3.0 300mm)

I tried to square my frame according to the guide but no matter what i do the resulting mesh isn´t changing at all. I run z-tilt after every change to the frame. I did this over 10 time now (didn´t save the older meshes) still always with the same result. The odd thing for me is that the frame is definitely moving. I would be grateful for any tips.