I don't spray anymore. I wait until early October and just mow. It's not as clean looking in the beginning but it works out just fine the weeks roll by and we start getting some frosts. Most all summer broadleafs will be at the end of their life cycle and gone to seed. They'll terminate just from mowing. Its the grasses that will often bounce back on you until frost/freeze. It's an individual call. I try to stay away from spraying and such as much as possible because we don't know for sure how we're effecting our microbial community with such things. I'd like to move away from synthetic fertilizers too but its hard to grow enough forage on small acreages without the added N. On sandy soils you tend to run N deficient really easily too