I getcha. The .tga files are the actual picture files that you are able to edit. Here's my suggestion to you:
- Move the folders with the TGA files out of the ASH folder and put them somewhere convenient.
- With the default .pac files from the .rar in place, run step1_extract and indicate fitdiddy00.pac
- Now, take the .tga files you want to use and replace each of the file in their respective folders (make sure the file names are the same and that you're replacing the right files. This could require a side-by-side comparison using GIMP.
- With all files replaced in their folders, run Step2_create, and you should receive the proper files. Rename them to fitdiddy##.pcs and .pac respectively (with ## being the color scheme assignment you'd like to give them), then copy them to the proper directory in the SD Card, and you're done!
Hope this helps you, man. Let me know if you're able to take care of it. Best of luck!
(Edit: I also believe that "+2" in the file name might be causing the bulk of your troubles, so I should re-emphasize the point to make CERTAIN that your file names match the ones created in the extraction process.)