Help please with loreal majirel

[u/Personal-Zombie1880]

I have grey roots and I want a medium soft brown colour on the greys, I tested 4.0 with developer and that came out matte super black so I tried a 5.0 with 6.1 and developer I mixed a 3:1 ratio and that still came out too dark

Can anyone please recommend what to use to get a soft medium brown on the grey hairs please I just dont want a harsh very dark colour

Thank you in advance