These guys have all gave great advise. Any technique needs a lot of practice to become effective with good form & power. The point of kata I always teach my students is the more you work on speed the more your power & form will suffer, the more you work on form the more your speed will suffer, the more you work on power, the more your speed and form will suffer. The key here is listening to your instructor at what they have to say and practice, pratice, practice. At your rank, your are still very new to kata and your techniques will improve with time. Good luck