Depends on variation. I'm mostly using Vicious right now. Midscreen I'm doing B121 xx exDB2, NJP, F2, F3, 4 xx BF4 for 38%. You could also swap out the 4 for 2, F4 if it's easier for identical damage, but I think it's a little harder for this combo. The same side version of that would be the same exact thing sans F2.
So far I can't do more damage than that canceling into exBF2 instead.