The traits you'll notice are the traits that your dogs have.
ie: cold nosed, hot nosed, strong hunt, weak hunt, on the line, off the line, etc.
Both parents should be complete dogs.
Dogs lacking in ability will produce the same.
I like a linebred female outcrossed to a good male.
Seems to produce consistency, with hybrid vigor!
Then eventually take the hybrid pup and cross it back into the line.
You could go paternal or maternal, depending on which direction you wanted to go?
My secret weapons are 7 days old. Linebred female bred to one of the best males out there.
Time will tell.