By David Craven Willie Peters insists there’s more to come from his brilliant Hull KR side even after they bullied World Club champions Wigan into submission. They meet again in the Challenge Cup semi-final in three weeks’ time. And ruthless Rovers will fancy their chances of back-to-back Wembley appearances after this emphatic display. They needed a response after being walloped 36-6 in Perpignan last Saturday and they certainly delivered. Tries from the outstanding Sauaso Sue, Oliver Gildart, Peta Hiku, Ryan Hall and Kelepi Tanginoa reduced Super League kings Wigan to only their second defea…