BARCELONA :Formula One's stricter front wing flex tests have made no difference and the money spent on making changes would have been better given to charity, Ferrari's Lewis Hamilton said on Saturday. The rule change had been eagerly awaited for the Spanish Grand Prix weekend with some hoping it might help slow runaway leaders McLaren. Instead, the Woking-based team swept the front row at the Circuit de Catalunya with championship leader Oscar Piastri on pole position and his closest rival