I've got a Toro 48" hydro walk behind with a 15hp Kawasaki. My problem is that when cutting (3-3.5") I'm leaving behind strands of grass that stick up. The blades are 16.25" . I'm even using Gator blades. Yes, the blades are very sharp. Have any of you had this problem? And what can I do to correct it if anything? I don't want to cut twice to get a nice lawn. I'm also only moving at a walking pace so traveling too fast across the lawns is not an issue. I'd appreciate any suggestions.