i switched styles after being a 1st dan. i had some random guy in class who had been taking for about 6 months or so lecture me for 10 minutes on how to make an appropriate fist. i was calm and listened. the instructor, knowing my background, laughed at the guy. i needed to work on patience. this was an appropriate task. once or twice, let it pass, but ultimately, you have to do what is best for you.