I've been consistently practising pick-up for years, which includes specialising more in day-game than most people I know. And what you described still happens to me all the time. Do I get success as well? Absolutely. You have to take the good with the bad... certainly no one's "above the process". In terms of tips to help improve your efficiency, I would say your apparent "frustration" has manifested into outcome-dependence which women can sense and makes it more difficult as time goes on.
My best day-game victories have come from completely letting go, being very self-amused and not even thinking - a pure expression of positive state while being calm, relaxed and sub-communicating that I'm a normal guy who lives in abundance and takes chances. Due to some girls not liking you approaching them, you might be missing chances with more open girls to build rapport, instant-date, escalate, etc - everyone's different and you have to stay content no matter what.
In short - focus on what you have control over, keep learning about day-game from experience (ie. judging comfort levels and moving things forward) and focus on what you have control over (ie. strong reality and attempting to defeat negative social conditioning), instead of what you don't have control over, like flaky people or bad state that is bringing down your state "to their level". Remember, most people are "plugged into the Matrix" in everyday life. Good luck!
SNL is Same Night Lay... but in this case, we could call it SDL.
