I'm pretty sure I screwed up the watering. I watered for 7 minutes at 7:30am, and then 14 minutes at 9:30pm. Most of the "brown squares" were waterlogged and the soil had washed away. Today I replaced those with new sod squares, and switched my watering to 5 minutes at 7:30am and 5 minutes at 1:30pm. I read where watering at night wasn't ideal, nor was having a soggy yard (which I definitely had).
Thanks @freyguy for the dillo dirt suggestion. I live in Dallas so I'm not sure we have that here, but I did spread some Black Kow (manure) over some of the trouble spots. Hopefully that has a similar effect.
All in it took 3 pallets of St Aug (I guess my yard is more like 1,250 sq ft) and maybe $150 in top soil/Black Kow, so I saved over $6,000 doing this. Additionally, since I did this myself, I burned a shit ton of calories. I tracked them, and over a 4 day period I burned 2100, 1500, 1800 and 1500 calories. Almost 7,000 calories total over the 4 days. Pretty sure that equals out to about 2 lbs. It was hot as hell throughout. Definitely a lot of work, but the board's inspiration kept me going. Thanks!!