So I finally had a pro come out to my house today. I have been fighting it since March. I dethatched, ovrseeded, fertilized, watered, everything. I can't get some spots to regrow at all. I had about 40% of just dirt in my yard (we moved here in October). It's about 90-95% filled in now, but some of it is then, I have crabgrass growing, but not too many other weeds. The pro did say one thing, I am cutting it too low. He had thought I just cut it when he said that, but really it's been a week already. He said the back is ok, height wise. My question is, what can I do? I am certain the mower is already on the highest setting.