Best size for you line of sporting dogs?

What up peps what wld y'all say the best size for your line shld be ? When I 1st started breeding years ago my 1st dog was a male 50-53 lbs the 2nd was a female bout 55 lbs she a inbred Angels blood ace of ace 1 with a out of the blk cowboy and budwesier blood she was bigger than the male he had to climb the later and she started out all small and skinny lol ! Of course these made 45-55 lbs big ,strong ,long with big head and mouth dogs ! Years have passed now I use a lil 40 lbs bitch the last 2 liters and I have 35-45 lbs dogs and I know some peps say better is better but I like the 35-45 lbs better ! They are super quick ,fast, and more athletic ! Was wondering in the USA what is the average size now a days in y'all yard .