How do i make my custom colours stay inside the colour grid and be where i want?

[frozencat]

Im having trouble making my custom colours be where i want they either go outside the grid on sonics head or go to the bottom right and push another colour on sonics head or just stay on the bottom right this is my code for it sorry if its bad this is my first mod
freeslot("SKINCOLOR_JETGREY")
freeslot("SKINCOLOR_CARBON")

M_MoveColorAfter(SKINCOLOR_CARBON, SKINCOLOR_JETGREY)
skincolors[SKINCOLOR_JETGREY] = {
name = "Jet Grey",
ramp = {7,7,9,13,15,16,16,19,23,23,23,23,24,25,25,31},
invcolor = SKINCOLOR_BLUE,
invshade = 13,
chatcolor = V_INVERTMAP,
accessible = true
}