The real problem with PFPX is the performance file which is encrypted. An example: The Fenix A321 is available with ACT 1 and ACT 2, unfortunately the PFPX .per file is encrypted and not editable and, therefore, it is not possible, for example, to change the Max take-off parameter of PFPX for the A321 (engine type IAE V2533-A5), set at 89,000 Kg in the .per file.
If anyone can do it, please come forward.