I wonder if the problem could be the high cam sensitivity. Because when it happens to me, my character also does a fast twirl while looking at the sky.
I have tried many many settings, low medium and high. I prefer the higher because I hate the moving in treacle feeling. They just haven't and probably never will get it right. But I will say this, there's only one way a wiimote should work, and thats the RIGHT way, NOT TREYARCHS WAY..
And the problem still happens on low speed and sensitivity? (I havent tried).
I never tried, I always try out my settings in combat training, if they feel to stiff (in low settings) I just stop and adjust. Never used the low stiff settings in actuall MP, so never got the chance to turn quick.