It’s better to use the gamesdb built in scraper for ps1, because sometimes the file names don’t match, youll have to manually change the name while scraping then it should find every game no problem
I helped Sselph getting the PSX ability sorted so I know it does work (or at least should work). Do your .cue files point to the .bin (this is case sensitive!)? Perhaps you have slightly different hashes to what’s on redump.org – in which case it would be nice if there was a way you could send these hashes to him to update the database for future users :)