If you dont want to have a ligther color on the imp feather, maybe you can change the color of the small round 'stone' behind our head. As you can see, every Valkyrie Helms have a small 'string' or something that will connect with a round 'stone' at the back of your character's head. Maybe we can just recolor the stone with the same color of the Imperial Valkyrie Helm, so that we can know which one is Imperial which one is not. You can see it from the Grey Imperial Valkyrie Helm which someone in the server has. Rather than having a ligher feather. If you know what I mean.
And yes, the recolors that you have done are beautiful. The silver one, looks a bit blue, but it's maybe because of the existing blue one doesnt have that much color?