It sounds like you planted it to deep. All you needed was about a 1/8-1/4 inch deep not 1 or two inches. The seed maybe rotting before it can reach the soil line. (spend 3 grand and buy the lesco seeder if you are going to do any number of renovations. They kick the bluebirds butt) Also get a soil test. Jusy cuz dirt may look good is no indication of what nutrients it contain. If you don't have enough P, then the seeds will die at germination. That is very possiable why it is patchy.