My new Neo2 was having bad pedal slip feeling even in the big ring lower gears on zwift so I had to set trainer difficulty to 50% and even then riding up to radio tower was horrible. I could barely use granny ring in any gear without slip over 300w.
i appear to have fixed it by going into tacx training app and setting my weight to 75kg with 6kg bike. Looks like by default it was something like 95kg and 10kg bike.
just ridden up the Alpe and I can now even stand up at 450w (briefly!) in granny 3rd and it doesn’t slip. Also when it does start to slip it’s a much smaller amount. Previously it would almost give up with minimal pedal resistance.
Thought it was worth sharing this as it has transformed my experience of this trainer.