if i recall correctly, z-force has a smaller sweet spot compared to other rackets. Adding in stiffness and head heavy-ness, as other fellow forumers have said, you will definitely need more time and effort to get used to it.
It's not that small I got used to it in a day, I don't have timing issues either. The racquet is rated extra stiff but the head heaviness makes it feel like stiff/ medium stiff. But yeah it does take time I guess for other people. I'm used to head heavy and stiff racquets maybe that's why.
