You can delete the rest, like I posted above.
Which EFI string did you try? I mean you should try to extract the string generated by GraphicsEnabler when it works, then disable it and insert the string into Boot.plist. I'm guessing Chameleon is having problem to generate device-properties string, but sometimes it works. The idea is to grab the working string and use it directly, so you don't have to rely on Chameleon to generate it every boot.