I fertilized twice. Once in April and again in June. Didn't start to die off until August. Pretty sure it's not over fertilized. I'm gonna rotatil it next Spring and start over
Your going to be in the same position this time next year, unless you irrigate it. Your Spring seeding is doomed to fail. Sure, it’ll look great in May, but unless it’s able to establish deep roots to get water, the shallow roots will bake with that slope and solar orientation, drying out and killing them.