Depends if you can afford the frags needed for the last sb .

You are somewhere along the 20k coupons for the garanteed last sb.

Now take into account that you will need 4 prot per try and that you are on the worst possible situation currently : There is only 1 better outcome for a 1 vial 4 prot cost .

You may get the last sb quickly or it may requires 30+ vials (and 120+ prot ).