Bigger runs for Jamaal Charles?

Kansas City Chiefs running back Jamaal Charles has had a fantastic year, ranking top-5 in rushing categories NFL-wide. He's also been a top-2 fantasy player, by and large. If one had to quibble, it would be with Charles's lack of big plays this year. Charles had broken only one play of 20 or more yards through the first nine weeks of play. The last three weeks have been better. Is there reason to believe that could be changing?