I am in the woods so I know the struggles. I can get cool season tall fescue established just fine in the early Fall, and it will thrive in the Spring and early summer, but once we get the persistent heat, blazing high sun, and the trees are all active, a significant amount of it just gives up and goes to thatch. Some areas hang on enough and come back. I let the moss do its thing for the most part, and try to keep a nice grass area in the back (over the drain field) around my firepit area. I just have to do a fairly significant reseed every year in late Summer/early Fall.