5/75 showing lighter on roots?

[Clararostock]

I was wondering if someone could help me please?
So i had bleached hair under this but I put on 6/75 +6/0 =parts 1.9% colour touch
But it faded up alot so next time I used 5/75 + 5/0 equal parts colour touch.
And I feel like each time my roots are showing lighter and the ends have grabbed more. How do I get this to not happen?
I'm not sure what to apply next time I need to colour my hair.
I do like being a level 5 though and rich tones. I have added a photo to show you can see it here.
Thank you im advance!!!

 

[ronray]

I was wondering if someone could help me please?
So i had bleached hair under this but I put on 6/75 +6/0 =parts 1.9% colour touch
But it faded up alot so next time I used 5/75 + 5/0 equal parts colour touch.
And I feel like each time my roots are showing lighter and the ends have grabbed more. How do I get this to not happen?
I'm not sure what to apply next time I need to colour my hair.
I do like being a level 5 though and rich tones. I have added a photo to show you can see it here.
Thank you im advance!!!

Only do the roots. Don't take the colour through to the ends. The ends are a lot more porous than the roots. The ends absorb the colour , the roots will be less likely to take the colour because the cuticle is tighter at the roots and won't be opened by 1.9% enough. 1.9% will be enough for the ends because the cuticle layer is already weakened and more than likely damaged.
Use 5/75 + 5/0 + 4% and only do the roots.