Don't keep using kotegaeshi when you've landed it the first time.

The only time it is worth using it repeatedly is if you are hoping to get the "crunch", which then means the person can't use their offhand, thereby depriving them of shields, two-handed weapons, wands and the like.

Other than the above situation, once you hit the first one, it is worth switching to a different skill, such as throw (although not in this case, since hand to hand specs can roll out of throws). I'd probably have switched to sweep kick. Kicks are reliable damage.