Most guys, and particularly well trained AFCs, don't understand the underlying psychology of C&F. The reason is that it's counterintuitive to the "be nice" thinking they've been conditioned to for the better part of their lives. So consequently, when they do make their first attempts to behave a bit more ****y, and apply some humor to their dealings with a woman they're interested in it comes off as scripted or "a line". Add to this that they're more often than not trying to use C&F on a ONEitis or LJBF girl in some new effort to get her to come around for him and you can see the recipe for failure. If you use C&F or really any PUA technique with a woman who's already familiar with you, or is part of a social group who is, you'll be perceived as "trying to be something you're not."
Think of it this way, PUA skills and techniques are tools. And just as any good artist or carpenter will tell you, the quality of your work depends upon your own talent and how well you can use the tools you have, not the tools themselves. It's not the arrow that misses the target, it's the archer. C&F works, Neg Hits work, but only insofar as the ability you have to use them as tools, and only so far as your own ability to understand what tools are needed for a particular job. If all of you have in your DJ toolbox is a hammer (C&F) then all your problems start to look like nails. Sometimes different tools are more appropriate for different women. This is the Art of Seduction, knowing which tools to use, and how to artfully apply them for the best result on different women.
Now, with that in mind, I'll also concur with RADIODUDE, your charming personality and bulletproof PUA skills wont make you look any better with your shirt off. There is a definite physical aspect to attraction - it's called arousal. If you cannot physically arouse a woman, all the C&F in the world wont make her sexual interest in you legitimate. No training is complete without the physical. If you think you'd be better served in the gym, then by all means take 6 months off of SoSuave and build a better physique. There is a definite confidence that comes from that. Just don't think that's all there is to it, or you'll find yourself in an LTR with a woman who liked your body but leaves you when you revert back to being an AFC after a few months.