Hi Stefanoo,
unfortunately I can't help you much, I have no experience with Zyx4D or Terminator Arm. I had a few Zyx in my System running, with various Arms and all were good. Also with Test records or different turntables. Zyx carts are in general easy to go, there are other carts which are more critical to Arms. But a distortion is mostly based on wrong Arm-Design or Geometry.
I know, Tonarms have a lot of influence and not every Design is really so good like fan groups or marketing suggest but unfortunately this is a endless chapter.
unfortunately I can't help you much, I have no experience with Zyx4D or Terminator Arm. I had a few Zyx in my System running, with various Arms and all were good. Also with Test records or different turntables. Zyx carts are in general easy to go, there are other carts which are more critical to Arms. But a distortion is mostly based on wrong Arm-Design or Geometry.
I know, Tonarms have a lot of influence and not every Design is really so good like fan groups or marketing suggest but unfortunately this is a endless chapter.