Alright I did it again at 17. Don't have individual attack numbers but I have final health value.
There were no misses along with judicious use of special attacks. I don't know exactly the upgrade values of the my friend's armors, so I put them in as a close approximation to the numbers they show
Here's the link to my spreadsheet:
https://docs.google.com/spreadsheet/...kE&usp=sharing
The boss won. He had 3903 health left. According to the sheet, with no misses, I should've gotten him to 429. Which is around 5-7 hits off.