As was mentioned earlier, I think congruence when it comes to C&F is really important. I don't know about you guys, but I for the past 6 months I've been C&F with EVERYBODY. It has become more a part of my personality, not just some "technique" I turn on with chics.
I mess around with my boss, my buddies, the cute married chics at work, whoever. So if I go up to a chic and have my C&F going with her, it will seem natural and as she gets to know me more she will also see me being this way with other people, and I'll just seem like a fun, cool guy.
Of course, I'm not a male model so maybe that is why this works for me. But I'm not Igor either, so who knows.
But there is definitely a level that you can reach with C&F, and you shouldn't exceed it. I may mess around with my boss and tease my buddies, but not all the time. If you guys are getting bad reactions from chics doing C&F you are doing it too much. At some point you need to relax a bit and try to build some rapport.