Has anyone had success with Hi-Yields' Pre-Emergent Herbicide containing dimension? The bag states it will treat up to 15,000 square feet. My yard is 9,200 square feet and using the lowest setting of 6 with a Scotts Accugreen 2000 drop spreader, I was able to treat about 90% of my yard. It seems to me that the settings are off. Has anyone else used a Scott's accugreen drop spreader to apply this stuff? What settings did you find worked?