Welcome to the Grey forums. Where at in Texas? I'm north of Dallas.
CAG's don't screech like a conure, although they can learn to if exposed to it. Mine learned to do morning and evening screechy time because my Caique started her on it. I would say at 5mos your CAG is just figuring things out. Ours is 14mos and she is getting louder with all her new repetoire of whistles, caique screeches etc.