by Charlie Drayton - The NSW Waratahs are still searching for an 80-minute performance in 2015 and will be looking to rediscover their mojo when they take on the Brumbies this Sunday afternoon at Allianz Stadium. Conference leaders, the Brumbies, have proven to be the benchmark team in this year’s competition with a win on Sunday ensuring a clean sweep of victories oerl all four Aussie sides in just six rounds of Super Rugby. Waratahs coach, Michael Cheika, knows Sunday’s fixture will be a real test for his men as they look to close the 10-point buffer the Brumbies currently hold. “The Brumbies have been far and away the best team in Australia this year, but I believe in my lads 100%,” Cheika said. “We have probably just been lacking a little bit of edge and on Sunday we are going