They are adorable.  I'm not picking on the shade of yellow--white, real yellow, yellowish red, whatever.  It's the pigment thing that drives me crazy, so I always enjoy looking at your dogs because you pay proper attention to pigment.

Poor pigment is to be expected in a lab that is obviously poorly bred.  If the head and body type are off, why would the pigment be any better?  What really gets me is when I see a yellow who has a good head and proper lab body (not too lanky, not too heavy), in short a dog who looks as though his breeder put real thought into producing a classic lab, but the nose is a dudley.  Even I know you have to breed back to black, and I don't have a lab, and I don't breed anything.  The otherwise gorgeous dogs with poor pigment are the ones that really drive me nuts.

I hope you'll continue to post pics as the pups grow.

There's a practical advantage to the black pigment.  If the issue was just about being pretty, I wouldn't give a rip about it (although I do have to admit that the black does look nicer).  Black pigment produces features that are tougher than lighter colored features and thus allows the dog to work without injury in harsher conditions than the dogs with lighter colored pigment can withstand.

Dogs that evolved as pariahs always have black pigment, and that's no accident.  The black helps with survival because it leads to fewer injuries.