ERG Tacx Flux 2 Erratic

Ive recently changed from a wahoo Kickr snap to a Tacx flux 2. Kickr had no Erg Mode issues. Held watts really well.

My Tacx flux 2 seams all over the place. My ERG mode wanted me to hold 230Watts at a steady cadence. I held the cadence and my Watts were all over and spent majority of the interval at around 215 watts. Have I just wasted £700 on a turbo that doesn’t work on ERG mode very well? Or is this something I can resolve ?
Im on an ANT + connection into my Apple Mac - my dongle is on my bottle cage. very frustrating indeed trying to do a workout.


Feb 2022. Same issue. Was it resolved?