Color Remover or Bleach?????

Iv'e been coloring my own hair blonde for a long time now with rather good luck using Dream Blonde medium blonde level 8 color when doing the roots so as to not have it looking too drastic when growing out.  The majority of the top layer and ends are a light blonde.  Until recently I was satisfied but when I pull my hair back it was looking too dark for me so I decided to put some hightlights in.  Well some turned out great but it also turned the underneath and near the root area in some parts too warm/brassy and it is now interspersed with warm tones throughout.  I tried color removal and re dyeing to an ash to cancel out the brass.  It looks fine for a little while then the old color and brassiness comes right back out. 

Should I try to remove color again and use a protein filler (colored or clear) or should I bleach out near the roots (where the brassiness is) and recolor?

 

My ultimate desired color which I have been trying to attain with no luck would be a medium/dark neutral beige/champagne/sandy blonde base with lightest blonde (not gold) highlights. 

Any advice would be greatly appreciated.

Edited by dobiesmama - January 21 2009 at 8:21am

Thank you suicides eve.  I actually just did that very thing yesterday.  I bought a deposit only medium ash blonde 8A with a little bottle of red-out mixed it with 20 vol prior to that I put in Lorea'l color primer to coat the hair.  It is now a muted ash blonde with no brassiness I am now going to add a few more highlights as the ones I had before got a little covered up and don't look as bright.

Edited by dobiesmama - January 23 2009 at 10:20am