Assuming the defense gets 40 scholarships, we should aim to have:
7 DE
7 DT
3 WLB
3 ILB
3 SLB
2 Strikers
6 Safeties
9 CB (with at least 3 having the ability to play NB)
Nice breakdown, and I'd say with Diaz scheme preferences, there is some flexibility at the striker/S/LB spots...I personally would go more like this
16 DL (you are prob redshirting 1-2, i wouldn't even argue with a 17th)
10 LB/STrikers (2-3 pure mikes, or maybe one of those mikes has ability to play elsewhere, i.e. a better Mike Smith)
8 CB ( including nickles)
6 safeties (again a Corner or Striker maybe can help here)