I have a 2003 60" Dixie with a 25 Horse Kawasaki. When I first bought it, the cut was fabulous, both sides of the stripe perfectly even. Now, each stripe has 2 streaks of taller grass in the middle left a right. The streaks appear to be where the outside blades meet the middle blade. I know the blades are almost perfect. What am I doing wrong? I know this dixie has fabulous potential and its frustrating to not have a flawless cut.