@juicepouch
So I decided to ram my noggin against this and I can't get more than 35% meterless / 40% EX command grab (no fangs, no jip) - It's around 1-2% more than my typical corner combo. The problem is that it scales so much at at the end, what seems like it should be 36% ends up being 35%
Here's a few combo paths you can take to reach that (all of them start with b12u2) - all of these will do 35% meterless / 40% 1 bar when not in Dragon Fangs (DF will add maybe a percent or two, didn't test it.), and add 2% with a jip.
b12u2, d2, 121 xx dbf3
b12u2, d2, 21 xx dbf3
b12u2, d2, 3 xx dbf3 (you can actually do 3d3 xx dbf3 for... exactly the same damage. Not even kidding.)
ji3 (or 4), b12u2, d2, d3 xx dbf3
b12u2, d2, 4 xx dbf3
If you get them high enough you can probably get 1, then either 121 or b12 xx dbf3 but I couldn't get it in this test session.