i assume you are using katana?
if it is a masterwork katana, you mgiht be able to do 9/30, but i doubt it will be very succesfull.
I had a 12/27 build before i retired with a balanced katana, and that i possible, and, imo, a good solution.
I only bounced once in awhile on guys like goretooth, but nothing important, and the dmg is good enough to kill medium armored ppl in 3 hits, and you'll be so much faster than plate users, that you'll be able to kill them easily.