I'm guessing from your description that your lawn has probably largely reverted to less needy species. In which case, they don't need that maintenance to grow a

I'm guessing from your description that your lawn has probably largely reverted to less needy species. In which case, they don't need that maintenance to grow and you are probably beating that 8% pretty handily. My front lawn right now is full of daisies. I have been purposely not mowing sections of it, because they're covered in bees and I can't bring myself to leave them nothing! Anyway, like you, I put in zero chemicals, but that stuff still grows well above 8% of the chemical-fed grass a few houses down.