I saw an old thread but would like to see if there have been any updates on this since 2017. I too have a RealAxiom and finally upgraded my PC to a 64b OS so I could ride Zwift but have run into the low wattage issues some others have mentioned. I ride similar effort on my RealAxiom App and show wattage 30+ watts higher than Zwift shows, and when I look at my rides on my outdoor bike (I have a dedicated bike for the trainer) that has a PowerMeter on it I am much closer to the RealAxiom numbers than the Zwift numbers. Basically this isn’t a big issue for workouts, but group rides become hammerfests for me even if they are social rides for others. While my FTP is close to 240 outdoors, and on my RealAxiom SW, if I try and hold 240 on Zwift I go red HR wise very quickly and die after just a couple of minutes. On my RealAxiom I can hold 300+ for over 5 minutes in my interval workouts.
Anyway, was wondering if anyone had come up with some sort of hack/fix for this. Thanks in advance.