I can't see the punches or kicks happening, it might be because your reactions aren't subtle enough to tell..
You could try animating the combo and reactions without double framing any of it until you're completely done animating the movements ( I mean once you've animated the whole combo, then start to double frame where and if it's needed).
What also might help you is if you animated it as if it were in slow motion, because you're using a high frame rate the animation won't tell the difference until you double frame and add shakes (adding shakes helps loads for good impact, not necessary for combos but they sure do help)
