Upping the power of the RB10's Renault 'power unit' is no longer the only problem at Red Bull.
The reigning world champion team is now contemplating how to get its quadruple consecutive title winner back up to speed.
Sebastian Vettel has struggled to match new teammate Daniel Ricciardo's pace in the new turbo V6 era, and in China the German's mood appeared to hit a new low when he responded to a team order with the words "tough luck".
Team boss Christian Horner insists Vettel is simply yet to find the right "feel".
"We know Seb is very sensitive with the car and how it enters into a corner," he explained.
Dr Helmut Marko, the champion of Vettel's career since...
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