For me, my biggest bump in win/loss records happened when I finally figured out my own "magic combination" of the proper equipment: racquet, strings and tension. Once I was able to keep the ball in play more often, that allowed me to move the ball around more on the court. In the past, I could never hit more than 2 balls in a row during a match. I'd have 40+ UE's per singles match.
now that I'm using the right equipment, I have 10 to 15 per match. I haven't changed the way that I play. My forehand/backhand and serve are all the same.