■ Mitchell more interested in improving than in win streak.By SEAN HYlfQNCourier sports writer MARIONCedar Falls' winning streak in football doesn't figure to come to an end this week.The Tigers (7-0). winners of their last 25 regular-season games.Jordan JuelC.F. quarterbackavel to 1-6 Linn-M a r Friday night.But counting the number of consecutive victories hasn’t been a priority for Cedar Fallscoach Pat Mitchell. Instead, Mitchell would like to see the Tigers further develop the play of promising quarterback Jordan Juel before the playoffs.The success of the Tigers’running game, as well as aseries of blowouts, have limited duel's opportunities, but the 6-foot-4 senior has still shown Mitchell his talent in seven games.“He’s tall, he’s rangy he can