Persona 5 not recognising my save files

Hi all, first post on the forum, and sadly it's not a happy one. I've been playing Persona 5 for quite a while now, got about 85 hours in so far. I save my game this morning, and a second after it says the game is saved, my system crashed and needed too be thirdreb. Now, when I try running the game again, it freezes just before the main game menu opens up. The only way I can get it to get past this point is if I remove the param.sfo file from my save folder, but then it lists no saved games at all and I also can't save to make new ones. Suspecting my param.sfo file was corrupted, I substituted it with the one in with the HDD game data folder, but with that it then freezes before the menu again. I'm thinking that I should now remove and reinstall the game again to allow it to build a new param.sfo file, but will it then lose all my shaders? If this still doesn't let it see my saved game, is there anything else I could do to try saving it?