Zipper, the ^ thing kinda works, but now the [ error got into play.
Edit: The missing rotations got into play.
Essentially, you're asking people to do this work for you.
It would be the quicker, easier route, but nontheless for that, you won't learn anything that way.
After turning on "use percent encoding", make sure you go through and rename all of the sprites to the correct symbols etc, open the default tails.plr file and compare the sprites and rename them as they should be named.
Seriously though, why would you need Tails to thok? Sonic can do that already. :/
What I also suggest; if you are using SLADE (which I assume you are), in preferences under Editing, make sure you uncheck "force uppercase".
If you continue to have problems, I would suggest using a different WAD editor, SLumpED in particular; I find it to be more stable, and percent encoding is built in. Same as any WAD editor though, you must disable the forcing of uppercase entry names. In SLumpED, go to file>options, and it will be the checkbox just above the last.
I do not recommend XWE however - it's a terrible wad editor and it should not exist.
Have fun editing your wad.