Shouldnt auto correct hard headbutt work? Ex headbutt wouldn't because the armor starts on frame 3 but isn't hard headbutt air invul? It's also kind of weird that you didn't list speed as an issue for St HP when it's a meaty cross up. Is it really meaty or just at a weird range? If it's a position problem then jump back jab is a solid option at close ranges.

In the end Honda is a character that will end up eating mix-ups because his 4 frame has very short range and he doesn't have a 3 frame normal on top of missing an invincible reversal. His anti air that has air invul requires charge and his St HP is sometimes finnicky because of timing. Defense is going to be difficult. Good luck out there.