i accidently used a vol 10 developer when dying my hair copper, which left my brown hair a brassy brownish kinda auburn.

i think if i use a vol 20 developer it should give me the desired colour; a vibrant copper kinda colour.

what is your experience with this strengh of developer?
was it really/too damaging?
was it strong enough? (i dont know whether to use vol 20 or 30? any tips?)
Leave in/rinse out:
Tresemme naturals conditioner
Boots curl creme
Co wash:
Original source conditioner
Garnier fructis repair&shine conditioner