I have 4 balls, 2 from Storm and 2 from Roto Grip. No cracking issues with any of them, including the VG Nano which has around 20 games on it now. In fact, I threw the VG Nano tonight and had a great night in the summer league.
I'd get in touch with Storm and have them replace it. The ball should not crack after only 6 games.
My arsenal
Heavy Oil: Storm Virtual Gravity Nano: 4000 AB
Medium-Heavy Oil: Storm Anarchy: 1500 polished
Medium Oil: Roto Grip Nomad Dagger: 1500 polished
Medium-Light Oil: Roto Grip Rising Star: 1500 polished