anyway, no matter LBA, sectors or aliens, WAD is a simple and understood container, if you have garbage or zeros then extraction was wrong (it can succeed when using a naive software, however I won't be able to help: I have no PSP) -> find the equivalent of IsoBuster to rip PSP games, master it, then you should be able to have a good rip

you can always share a list of PSP ripping software (if they run on Windows) and I can take a look to see if I find any combination of options you should try