By Jacob Leeks Mercedes boss Toto Wolff has hit back at suggestions he should hire a ‘design guru’ to fix their struggling car. The Silver Arrows have endured a dreadful season so far, following two previous years of struggle. The German side opted to change their philosphy for this season in the hope of sparking a turnaround. But those hopes have been dashed, with neither Lewis Hamilton nor George Russell finishing on the podium so far. They hit a fresh low in the recent Australian Grand Prix, when neither Hamilton nor Russell even finished the race. In the wake of that dire result, Wolff is …