Depends if they are milking or dry. I wouldn't feed 18% dairy nuts to dry goats, or even such a high protein goat mix. My dry goats (goatlings and females after drying-off and before kidding) are on mainly just sugarbeet shreds, some oats and hay/branches/grass. I also reducie the protein for my nannies in late pregnancy, they go back onto A&P All round goats mix in the last 6 weeks.
Milkers are on dairy nuts, oats and sugar beet shreds, plus veggies, fruit etc anyway.
If your goats are doing fine on your current mix - why change it?