I have a level 4 and trying to achieve a level 10 or 11 with tint. I am trying to achieve an ash blond and have had results in the past. I am pulling orange or warm tones. I currently use 2/3 40 volume to 1/3 color (8), plus 2 parts blue. This past time I added just a bid of power bleach to the mix with a bit of improved results. Any suggestions to eliminate the warm color?