I found another game save editor that maybe able to modify game saves to work with your ps3. It is called PS3 Save Unlocker Give it a try hopefully this one works!
PARAM Edit v2.0 is a possible fix for some of your lost save games you should be able to use it to create save games for your Playstation 3. You can find game saves around the internet that can get you close to places that you were in games.