T-45d Power Armor texturing problem

[BGatot]

I am trying to crate a more colorful t-45d armor. I tried simply replacing the default t-45d armor texture, and it works brilliantly! But now I want to make it a unique armor, so I opened the t-45d armor in GECK, give it a different ID and name, make all the neccessary adjustment, adding the texture to it, etc. and place one in the game world. It works, pretty much, except the arms and the backpack cylinder stays in original color. I've tried changing the "Biped model list" in GECK but after clicking OK it did not seem to "take" the changes. What's going on? What did I do wrong?