Sebastian Vettel admits Red Bull have found it difficult to improve their performance and bridge the gap to runaway championship leaders Mercedes over the first half of the 2014 season.The Milton Keynes-based team have dominated in the constructors' standings for the past four seasons, but over the opening nine races of the year have scored just over half the points total of the Silver Arrows. Both Daniel Ricciardo and Sebastian Vettel, meanwhile, are more than 60 points behind Mercedes' pairing of Nico Rosberg and Lewis Hamilton.While the Red Bull duo have enjoyed various successes this year - most notably Daniel Ricciardo's breakthrough F1 triumph in Canada - Vettel admits the Milton...
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