It sounds like you still need some instruction to correct your tennis form. Being a good Badminton player does not mean you'll be a good tennis player right away. The Babolat Pure Drive is a good racquet, but it is known to generate a little too much power. I'd recommend getting it restrung at a higher tension (60-62 pounds) for a little extra control. And consider taking some group tennis lessons/clinics, private lessons, or even a community college class to improve your tennis form mechanics. I'm guessing that you are hitting the tennis ball very flat, with too much wrist movement. You're going to need to learn how to lock the wrist at contact, and follow through to get some topspin going. A lighter racquet won't help you - that will just make your stroke faster, more powerful, and more difficult to control. If you do change racquets (and I don't think you need to), go with a smaller head, like that of the Wilson Ktour or Ntour (95). Good luck.