Sorry for the late response, I just came accross this posting. Next time PM me to alert me of the post.
Keelalagirl55 is right, 8.5ml of Nic and 1.5ml of flavoring. Because you already diluted the Nic from a higher strength, the calculation won't show the Nic strength after adding the flavoring. Next time you want to lower the higher unflavored Nic juice, use the calculator. Enter the Nic Strength and the Nic Target for an accurate result.
Using the Nicotine Combined function of the calculator, you will see that entering Nic Base 1 = 15mg, 8.5ml's combined with the flavor, Nic Base 2 = 0mg, 1.5 will give you a final 12.75mg, 10ml like Keelalagirl55 pointed out.