There will not be much uniformity with scatter breeding.
If you just bred best to best are you always going to get hybrid vigour?
If you are just breeding best to best there will be no hybrid vigor.
They will not really be hybrids after the first and second cross IMO
You want to concentrate the gene pool and then provide an outcross when necessary.
the new blood into your gene pool is what will provide the hybrid vigor.
This doesn't mean the damage is done though just cuz your good dog is outcrossed to hell.
You can build uniformity and get what you are looking for threw selective breeding.
Your numbers just wont be the same at first... or maybe they will.
Its no telling if a dog will produce himself or not regardless of what the paper says.
Its a gamble either way, your odds are just better with different scenarios.