Listen to this article The German car manufacturer is coming off the back of a difficult final test in Bahrain, with the team facing difficulties extracting pace out of its W13 because of excessive bouncing. Mercedes believes that key to it overcoming the porpoising problem is in understanding how the air reacts under the car – with the team having worked on numerous floor improvements. Over the course of testing, the team has tweaked the roof profile around the floor edge ahead of the rear tyre, and adjusted the cambers of the fences at the front. On the final afternoon of the Bahrain test, Mercedes cut away some of its floor fences as an experiment to see if that better helped airflow, but having realised it did not, it has now gone back to its original configuration. However, as part of its efforts to understand what is happening more, Mercedes is focusin …