So, in a nutshell, I have to use 1.21 for the best compatibility?
For some reason, the download on SC's site for 1.08 is actually v1.07.
I think 1.21 was included with v1.07, so I probably was already using 1.21 right from the start.
But when I downloaded game_config.txt from filetrip, for some reason the .txt seemed to be an html page instead of the actual list of game config.
When I downloaded it again, it worked properly.
I must say, I'm pretty happy with the emulator's performances.
FPS seems to be a little lower than usual, but it doesn't affect gameplay at all.