I think this streak has a LOT to do with cut height, grass type, and time of season. I was cutting at 3.5" Your thinner bladed grasses are what I experienced it on with the 66" demo. This time of year, we've been having near drought conditions, then we get dumploads of rain. The grass is confused. Half going dormant, half growing like crazy. I don't care what gets done to this deck to remedy the problem....I'm just very impressed with the speed of reaction from Hustler as a company!