I'll leave this here in case someone is looking for these fixes too. This has worked for me:
- Kartia: The world of Fate (SLUS00631): random glitched sprites/scenarios -> Convert the image region sector to JAP -> Build the .PBP with GameID: SLPS01343 (no need to change Main Game ID) -> Enjoy.
- Bloody Bride: Imadoki no Vampire (SLPS00526) [english patched]: freezes at the end of the intro -> Build the .PBP with compression level set to 1 -> Enjoy.
- Road Rash (SLUS00035): freezes at the start of the race in big game mode -> go to official settings and set disc load speed from normal to Fast (credits to
@Snowbro88 for the fix).
- Bust-a-Move 3DX: black screen -> Convert the image region sector to JAP -> Build the .PBP with GameID: SLPS01065 (no need to change Main Game ID) -> Enjoy.
- Time Commando (all regions): scrambled scenarios. This game is cursed. Use retroarch to play it.
Happy New Year y'all!