Line-Breeding Project

I have not read all these threads but if I was you Mike I would do a half brother half sister breeding with the old foundation bitch being the mother of both and if the two males are not related and both great dogs make them the daddy's .

..........................Male 1
...............
..........................Foundation bitch
...Pups 50% Foundation bitch
..........................Male 2
...............
..........................Foundation bitch

These types of half bro half sister breedings enables you to carry your old foundation bitch 50% and the two males can be a 25% one and 25% the other giving you plenty of Hybrid Vigor as so the pups can still be real athletes but still be heavy on your foundation bitch and they will be good producing dogs them selfs.

You could even do it as long as they are not full brothers but maybe somewhat kin.

Also as soon as I use to do these types of breedings I would then take these and breed right back in to the family of the old foundation bitch . You only need to outcross when the dogs tell you they need it in other words you start getting things you dont want like the size goes down , the wind is not there, the speed starts to slow down thats when you go back to the cross then right back to what you were doing .