Neo Bike Power Issue

Smart Neo bike, power feels is lower than Atom. After 2 hours Zwift cycle power felt around 50 watts less on Neo smart bike compared to Atom. I have 10 months of data and vs. Heart rate to compare. I know DC Rainmaker noted Neo bike was fairly accurate however I am getting creaking and knocking sounds at relatively high power output so this maybe contributing to this and ticket raised with Tacx.