Listen to this article Russell and his teammate Lewis Hamilton finished fifth and sixth in Miami last weekend, although they were well off the pace of the Red Bulls and Ferraris ahead. They had looked much more competitive in Friday practice, but that form faded as the weekend went on. Nevertheless, Russell remains convinced that the performance is in the car. “Yeah, it is there, we just need to try and unlock it,” he said. “I think we still don’t really understand why it’s so unpredictable. “Toto [Wolff] is throwing the word diva around a lot, but I think that’s a bit of an understatement, because it’s so unpredictable. When the thing just starts bouncing in the corners, it’s a killer to drive.” Russell admitted that the team was mystified at the way its form fell away after a strong start on Friday in Miami. “We’ve known all along there is a fast racing car there. Frida …