CdA - Best Bike Split Race Analytics

How accurate does the group feel Best Bike Split Race Analytics is at calculating CdA? Any best practices you would recommend? I’ve uploaded a few files. Looking for a larger sample size of experiences. I’m a 70.3 triathlete working on improving my aerodynamics. Use PowerTap P1 power meter and Garmin 520 head unit. Avid TrainerRoad user with a Kickr and podcast listener. Thanks.