I don't think so gun. I make mine with 5 in. but my son made me some with 4 in. For no better an archer than I am, I couldn't tell any difference. I suspect over a chronograph 5 in. might be a little slower but, as you said, any real world difference has to be minimal.

NRA Benefactor 2008

Jesus said, "I am the way, the truth and the life. No one comes to the Father but through me." John 14-6

There is no right way to do a wrong thing