Are they both black based or blue based or one of each? Don't know about the leakage, I know it happens but I'm not sure what causes it. Either way, your kids are beautiful! I just happen to like all of the science behind how we get what......They´re babies, only 2 months and 5 months old, thereabouts. And I know about the penciling and lacing, but I don´t have much choice here, so I mess about with what I have. I already had a look at that colour calculator thing, but my partridge hen with her gold laced cock produced mostly black youngsters with red leakage, and a few buffs, males and females of both colours. Well, I couldn´t get the calculator to agree with what they actually produced, probably because they have goodness-knows-what in their background anyway. so, now it´s just mess about some more and see what comes.
I hope all goes well for you with your new breeding program.
It's too bad you can't put in what you get out of the breeding and that gives you the genetics of the parents.