Yes, I have to agree with you on that. Although some girls like bad boys, most tend to get their defences up when they see one. I remember one time I approached a girl and it was going so smooth she got turned off. And because I like to twist things a bit I told her i'll give her my phone number because I don't take girls' phone numbers and she just shot me straight there and then with "Oh come on, i've had so many guys do that to me. I don't think it's normal. I believe the guy should take responsibility and be a man." So I got her number and she never answered. She was right to some extent. A recent example I had was when I pulled a girl (da bitch defense was on a 100) she couldn't stop kissing me but I couldn't get her on the bed. With some smooth effort i got her there and we kept making out but she was testing me. Trying to escalate and tell her we're not going to have sex, that we're just having fun and kissing each other, she said: Yeah, with your condoms laying on the side of your bed (it was my bad, completely forgot about them). She kept kissing me however she never let me escalate more than that. She told me I was a bad boy. I guess girls get defensive when they see things going too smoothly. Maybe that's my problem. I really don't know.
I'm sorry but how is a girl telling you to man up and take responsibility for a number, or a girl calling you out for having condoms right next to your bed equate to things "going too
Anyway, Jack's right. If you want to reduce the chances of flakes you need to go from start to finish and she must get a solid glimpse of your personality. And like it too.
Other than that you need to understand the volatile nature of cold approach. There is no 100% success rate. I personally don't even bother sending a text unless I'm fairly certain it will lead somewhere.