You are missing something. WNII does only give a 4 step bonus, not 8. If you are 80 durability and you cast WNII then 8 HT's, you are 40 durability. consequently, you could cast 8 HT's for the durability price of 4. This means the cost of an additional step with WNII is 24.5 CP per step. With MMII, it is 26.7 CP per step. Indeed it does make a difference, but at the cost of flexibility.
Can you provide a complete rotation (with final phase, BB, PBP and so on) that is 14 touches for these tokens ? My rotations are not perfect and I would be glad to learn how a WNII rotation can do better. I banged my head too much on WN and WNII in the past.