It was probably just a day where you were not at your best. However, I wouldn't leave balls in the trunk all the time. Get too many cold/warm cycles through it and potentially a cover could crack, setting you back the price of a new ball (or balls depending how many you own).
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