AMES, Iowa — Perseverance, confidence and two long kick returns propelled Louisiana-Lafayette to one of its biggest wins in program history, 31-14 win over No. All of us pretty much say our practices are harder than the games.” The Ragin’ Cajuns limited Cyclones quarterback Brock Purdy to 16-of-35 passing for 145 yards, with no touchdowns and an interception. “We dropped …