hey hairdressers! I have been a blonde for pretty much forever but I am naturally a mousy brown. I am getting so fed up with the brassy colour band I have when my roots come in. I use Koleston 12/16 + 12% and a t bar with pre lighter then tone it down with Koleston 10/16. In so fed up with the colour it goes and I'm scared to go dark incase I don't like it. I don't want to opt to all over bleach. Any suggestions.....??