Hi, I recently changed racket from AT900P to ZF2 and I am having difficulty getting used to it. Particularly, I am getting better control with ZF2 but having difficulty generating the same power in smashes with ZF2. My previous rackets are AT700 -> AT800 OF -> AT900P, and I had no problem transitioning between these rackets before. They were all quite similar with their extra-stiffness and head-heaviness. At first, I thought the ZF2 will be quite similar in terms of spec, so I bought it, but it felt quite different in reality when I actually played with it. It felt a lot lighter. Perhaps due to the ultra-thin shaft? I feel like my swing speed got faster but somehow the power in my smashes dropped instead. Not sure if it's due to the racket being lighter? From what I heard from others, ZF2 should be a smashing beast but my smashes got weaker instead. Can you guys give me some pointers on the key differences between the ZF2 and the AT900P in terms of power smashing and any advice on transitioning between these 2 rackets? Thanks a bunch.