The 20mm's choices might stay on the left-hand menu... I don't remember, but if you have a BOM file with 3 Shokaku in it, then something happened with the activation... I'd be more inclined, hard drive space allowing, to do a "fresh install" with a known-good SH4 base, then apply the mod to that, and use MultiSH4 to create a new Save folder for that before getting rid of the Save folder in the other file set. If the Saves are corrupted, and cross-contaminated the install folder, then you would blow the whole Save folder structure away in the File Manager of Windows. But that still won't get rid of that incorrect (for FotRSU) Battle of Midway file in the game folder...
