Been dealing with this for a couple of years now. At first I thought it might be quack grass but a friend of mine called it poverty grass (downy danthonia). It doesn't show up on the pictures very well but it's very hairy, wider blade, and grows about twice as fast as the TTF that it is occurring in. I can't seem to kill it with traditional 4D and each year the footprint of the outbreak is getting larger. Aside from pounding it with glyphosate and reseeding is there any way to treat this?