Did you manage to make it work? If not read this.
After trying alot of things i think i got some of the shit that cause issues, i've already beat the game in about 70hours, tho the game did crash here and there while also for some reason having to wait a bit for it to start on the first loading screen, the slashing screen bug is gone.
I recommend you to save state often if you get to play it.
1- Before dumping the hd textures/translation if you plan on using it, make sure you create the TEXTURE .ini file from the emulator Tools>Developer Tools BEFORE and after that you can dump the hd texture file there.
2- Do not, ever DATA INSTALL from the game menu. It prompts the infinity slash bug, or so i belive from experience.
3- For me at least, using openGL feels better(less random crash) and i'm using the Dynarec/Jit CORE. You can try other core if you still got any problems.
If you going to do this make sure you don't have any previous data files from this game on your emulator folder.