Paint rooster to cuckoo hen =
Around 25% black pullets
25% paint pullets
25% SF cuckoo cockerels
25% SF cuckoo paint cockerels
Black rooster to cuckoo hen =
Around 50% black pullets
50% SF cuckoo cockerels
There's no "black split to paints"
A paint is a black bird with one copy of dominate white.
Two copies would make a solid white bird
One copy lets black show in splotches
No copy makes a black bird but it isn't carrying a dominate white gene so its not "split" to paint.