Charpentier's team-mate Kenan Sofuoglu and Curtain's fellow Yamaha rider Broc Parkes are also looking to podium finishes at Valencia, as each has a third and a DNF to their name.
Solid and consistent high points scores have put Scandinavian riders Robbin Harms and Johan Stigefelt, of Stiggy Motorsports Honda, third and fourth - while surprise of the season so far is Christian Zaiser who has shown that the Ducati 749 series has lots of Supersport life left in it yet, especially during the most recent tests.
Megabike Honda's Katsuaki Fujiwara returns to action at Valencia, as he recovers from the broken scaphoid that kept him out of contention at the previous rounds.
After Valencia, the classic city centre speedbowl of Monza will be the next venue for WSBK classes, on Sunday 7 May. After that the first of two British based rounds, at Silverstone on May 28th, welcomes the series.