the best advice i can give u about charge partitioning is…and thats i discovered myself, charge in a way that, u charge so much, that when ur dashing or even just walking, u can perform the headbut with incredible ease…what am saying is, a good example…do a knee drop wiht fierce kick, then start charging down at that moment, then dont even dash when u land, just try a headbut…u will see that it will come out…now, do the same, but, this time, DASH, and try the headbutt…u will see it works too, i call that the perfect charge! its when u start charging at the right moment during one move, so that by the end of ur move, u can easely do a headbut or a knee drop, its like charging for 1.99999999999 secs, its just perfect, u can either dash or u can even allow urself to walk for a sec, then press down and up quickly and it still comes out!!! if u can understand it, then u will become a pro of charge partitioning…like Rx
i can charge partition just using a regular dreamcast or xbox or ps2 controller…not even a joystick
cya and good luck!