So my builder for my house designed/installed some failed irrigation that I am looking to fix. North end of my yard has consistent dry spots and trouble. The turf is being watered by 3 RB 5000's doing 180, 360, 180 across the center of the yard horizontally. Perennials having a couple RB 1800's doing 180's on the south end of the yard while the ones on the north end have no irrigation other then spray from the 5000's. Yard layout as seen below. RB 1800's and 5000's are separate zones pushing 65 PSI and 16GPM in 3/4 inch pipe. Anyone have any suggestions to fix the turf precipitation issue/layout. I would greatly appreciate it! Looks to me like ill have to retrofit it as i could add another RB5000 to fix the issue at the north end but then it would over-water the center.