I'm new to KI. I tried performing a manual combo on practice with Thunder, and sometimes I would get around 40% while other times I would get 77?! Sometimes I would get 15 hits, while others (holding the last button I pressed, the fierce punch, for the ender, it seems) I would get 16. What's that?
Getting more hits on your combo is because enders hit more times if the ender level is high (and ender level is directly related to the white life your opponent has). So, sometimes you were getting a level 3 ender (3 hits) and sometimes a level 4 ender (4 hits), because of the white life thing I explained above.