@DeltaBurnt, after your save file was corrupted in Kaura, you copied a working backup sav file over to your microsd, rename it to SAV then run the game again from the Main Menu and it got corrupted again, right?
the proiblem is, if you run a game from Kaura's Main Menu, and your sav save file got corrupted. then you copy a backup working sav back the to microsd and rename it to SAV, after that, you need to run the game from inside your Game Folder, not from the Main Menu, if you run it from the Main Menu it'll get corrupted again and again.
and the reason the Game Settings are not saved in Kaura could be because the OPT file that Kaura created (only 1FF in hex) is smaller than the OPT file that Sakura & Touchpod created (which is 2FF in hex), it should be the same files files for all 3 systems, but Kaura's fileszie is different (could be a bug) thus Kaura has problem handling OPT settings.