If black is too dark and white is too bright, try priming with gray.
What paint are you using?The only correct answer is Vallejo Metal Color, by the way It uses aluminum powder as the pigment with an ink for different colors.
Do you use it over a black primer?
I have great success with Citadel's leadbelcher over a flat black rattle can primer, thinned down about 3 to 1 with water or if available, thinner medium. you can pull the greatest concentration of the shinies to where the light would naturally fall and get a solid base, then hit with nuln oil or your fav black wash ( also thinned) until you reach a satisfactory level of brightness. Good Painting!
"You guys are facing a freaking Shadow Division! These guys have strict policies against playing fair!"