Part of the color problem is the size of the bait. Its so small that the amount of a single color in a two-color shot is too small to really work the light and show off. On real small baits I do a second color at the tail instead of splitting the body length-wise. If you get away from the two-color injector and hand pour you might be able to split the body colors with smoke or black to get better color definition. It just won't get much better than what you have here unless you do very solid colors and really juice them up.