My backyard tends to get direct sunlight all day. Any water (30 min) I put down in the morning seems to be sucked out. When I get home it seems like I never watered it. The soil is arid and the grass is browning. I've been cutting my lawn (kb, tall fescue, rye) at 3.5" but I'm thinking I may need to go to 4". Should I spread peat moss to retain water? Any tips?