Are you familiar with the reports of inaccuracy in this feature change? I can’t gauge the veracity of the complaints but they might be worth investigating to see if something is not working as expected.
https://forums.zwift.com/t/your-best-watts-bug/597077
Also, if the CP folder is no longer used to manage personal best data, this documentation needs to be updated:
https://support.zwift.com/en_us/re-installing-zwift-BymCF82TH