I am still learning myself, and you will always need to use the fundamentals, but one thing I can tell you that helped me out a great deal was watching some of the better shooters, not trying to keep up with them, but watching their foot work, and how to break down stages. I was once told to look at a stage and break it down and figure out how to effectively shoot each portion based on my skills. Once I applied the fundamentals consistently, and started to figure out stages, I noticed great improvement.