By Madeline Coleman Lewis Hamilton’s car is ‘undriveable’ and now, the younger teammate is experiencing chest and back pain after worst weekend of porpoising yet. Mercedes and team principal Toto Wolff continue to deal with the questions and criticism about this year’s performance; however, there is a new reality they face. This issue presents a greater problem, one that is much more severe than not finishing at the team’s historic standard: real, human pain. George Russell finished in fourth at Imola, but he revealed afterwards that the car’s “porpoising” problems were far worse than before. …