Thirteen seconds behind Slight and over half a minute behind Corser, Edwards came home a dejected tenth, taking a miserly six points from what had been a disastrous weekend for the Texan rider.
Further back still, the final points scorers were Haruchika Aoki, Giovanni Bussei, Andy Meklau, Lucio Pedercini and Alessandro Gramigni.
Corser's double was the first such success for Aprilia in the 301st World Superbike race since the series was inaugurated. The Australian now moves eight points ahead of Chili in the championship and is just 38 points behind the leader Edwards. The next round of the championship is at Valencia next Sunday which is another track which combines fast sweeping turns with tight fiddly sections. If the Aprilia performs as well there as it did in Misano then Edwards could be in trouble.