Power Curve For Tacx I-Magic?

I am not ready to buy a new trainer and continue to use my Tacx I-Magic trainer by setting a constant grade of 0.8% using another program (TTS or Netathlon) and then launching Zwift and choosing Other Trainer.  It feels about right but was wondering if anyone else who has a similar trainer could tell me the right combination to simulate a reasonably accurate power curve.

I’m stuck with the same problem. I got a tacx I-vortex. 

I’,m waiting for an answer from Zwift Support.

Tested all classic trainers. The CycleOps SuerMagneto matches the I-Vortex old model.