Alright, I am giving up on Fisticuffs since it doesn't give him anything useful. Fist Bump cant be activated safely without ending a combo with B2 losing like 10% and the nutpunch reset. The B121(etc) isn't even a true block-string. But these were the corner combos I have been using encase anyone had any interest.
F24, d1, 12, 12, 12, 12, B12-12-12-12 xx BD3 35%
F24, d1, NJ1, 12, 12, 12, B12-12-12-12-12 xx BD3 36%
F4, F4, 12, 12, 12, 12, B12-12-12-12 xx BD3 34%
113 xx EnBD3 F4, 12, 12, 12, 12, B12-12-12-12 xx BD3 36%
I really hope they give this variation something...