With all the slower guns cripple cannon was OP in events, you can't lie about that, all you do with it is spam and the knockback was crazy, knocking you into more bullets in which you can't even protect yourself
Was 50% - 10% too much? Maybe so, It should be 15-25%, but it just got so annoying especially in spar tournament and TTS, you just can't win. Rushing them also did nothing as you'd be knocked back, making it impossible to counter. It practically has an unlimited clip aswell.