The first stuff was Jack-the-Gripper, and the second stuff was Speedtech. In Europe we use CS High-Grip or Speedtech, and it brings the bite up well even on a Club night.

Why the JtG didn't work on a CRC carpet at the Worlds is a mystery. There are all sorts of theories about what is in the 'Euro' version of JtG compared to the US version, and what people were or weren't doing to their additive, but the fact remains that the JtG provided for the Worlds didn't work, and the Speedtech did. One day someone will tell us... HTH