If you try using the Elemental paired with those materia and check the 'Status' menu (not the Equipment menu) the Elemental Property Should be Applied. If not, then I guess it does not work.
If the method in the instructions does not work for patching the other disks, that is unfortunate, but once you know how to patch a disk, you should know how to patch the others. Glad you figured it out.
Just to be clear, I am not working on this mod anymore. I've mentioned it several times in this thread, but this was essentially practice for me. I initially made it for myself, but people expressed an interest in playing it so I made it available, flaws, bugs, and all. Please continue to post about the mod though, hopefully it will help future players.
@JeMaCheHi - LostWing and Revisited are different. My youtube videos illustrate some of the differences, and if you read the threads for each mod you will be able to get a better idea about how they are different. Also, only a short demo is available for Revisited right now, but I was considering releasing the updated version that I have. Unfortunately, I don't think that the PSP conversion will work properly. Others have tried unsuccessfully to convert my mod for use on PSP, and it is very flattering, but don't get your hopes up. Good luck.