Atra, good to hear from you. The graphic to edit is fx1, the white section below the mine rings.It affects all the overall color of phasers. The problem is the hard-coding of phaser colors. You have to find a shade that doesn't exceed the color wheel
tolerance of the preset colors. Also experimenting with gradients in the white area may help. Phaser4 seems to be strongly centered ,while phaserG seems more dependent on the the side bands. However,in general the color is derived from, at least in part the total color in the area. I use a whiteish center with sidebars of shades of blue with a hint of red. Sounds confusing but it gives me:
Ph4--Blue-white (the hottest)
Ph1--yellow-orange
Ph2--yellowish
Ph3--red
PhG-bright blue
Not much we can do until someone cracks the sprites file. Good Luck.