To be funny when you are doing C&F (1) you gotta have a smile always and (2) don't be serious when you say the cocky part, (3) the only time you should be kinda serious is when you are over doing the cocky part, like when the girl knows you are fucking around, still sounding cocky but it's funny. And the last (4) I can recommend, is sometimes when the girl is like "I can't believe he just said that" break a laugh (I know David always says don't laugh to get someones approval, but in this situation you gotta choose, sacrifice a laugh or fall into Jerk frame) or (5) have a like a smile-smirk saying "yah I just said that, I bet you never heard anyone had the balls to say something like that

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Btw: I live in a small city right now and I notice many girls don't get C&F here, they are too "conservative" and in contrast C&F works for me with party girls or girls who are from big cities, so if you live in a rural type of area that may be the problem and not you.... Also the problem may be that if they are in a group and your target gets C&F but the girls are always seeking approval from the mother head so if she doesn't get C&F they will take you as a "jerk" (I actually learned this like a week ago while sarging a whole group of sorority girls at a colleague bar and da whole night I couldn't understand why they didn't accept my C&F or Sexual jokes, and after one of my wings told it's probably not because they are conservative but because they are in a tight group and you didn't realize who are the main girls in the group are, who the other girls are looking at, like Braddock says you always gotta go from the waterfall down, take out the leaders and the girls below will fall into your arms haha....)
I hope this helps, cheers
