I don't know balls about programming etc., but when I changed my hud colours, there can be two locations for the XML file in the game, depending on whether you run it through steam or not.
I can't tell you the locations atm I'm afraid as I'm on my phone, but one is in the generic userapp folder iirc.
My point being that the first time I changed mine, I got the wrong folder, and changing the XML had no effect - but trying again with the other one worked perfectly.
Hopefully someone will be able to let you know if this is the case, and give you the complete info to do what you want.
Good luck, cheers,
The Hat
