Have been using using WBs for life of business until end of last season. Bought Wright Stander (52", 23 Kohler) and have been very pleased. Performed 10 hr maintenance and performance of unit remained high until 17 hrs. Mower began leaving a mohawk streak just right of center in every lane. Local dealer confirmed all settings and adjustments. I changed to new blades (oem type) and problem lessened. As I worked up towards my premium lawns at end of this week and as mower neared 23 hrs, the mohawk, 2" wide, 8-9" from discharge became very apparent! Left mower at shop yesterday after techs could find no problems. Any ideas gentlemen??? I slowed down to a crepp to no avail. My 15 hp Metro 36 has no problems at these properties so I am NOT buying the thick turf arguement.