Thats great but if you were having "IFFY" results with your slit seeder then you were doing it wrong or the machine was not working properly.
Besides that, what you are looking at in your so called "Drought damage" pictures is in fact Insect damage, probably sod webworm from the look of it.
I don't know if you are a chemical applicator or not but that's first year stuff.
I guarantee you that with one slit seeder, one man, and enough seed, I can make more money than anyone here in one day and have awesome results and probably never touch a hand tool like a rake.
Slit seeders are arguably the most profitable lawn machine per hour used out there.