I use FOROHFORERRORS python based app and I have models work fine (other than Okami). By all means try FortWaffle's editor tho cause it does work well. I did notice that a good deal of my auto hexed models from FOROHFORERRORS script wouldn't work on Final Destination for some reason tho (could be the game I ripped them from). :\ They work on Battlefield just fine tho.
If I had access to my Wii I'd help you, but atm I sadly do not.
If all else fails you may have to do some manual hexing. I hope some of my suggestions help you Eternal, however I know your knowledge of these things far exceed my own haha, so we'll see.