Have a look at this study about moving the "absolute" pitch anchor: https://www.psychologicalscience.org/news/releases/perfect-pitch-may-not-be-absolute-after-a

Have a look at this study about moving the "absolute" pitch anchor: https://www.psychologicalscience.org/news/releases/perfect-pitch-may-not-be-absolute-after-all.html https://www.psychologicalscience.org/news/releases/perfect-p... Maybe you could apply their methodology to yourself to retrain your A to 440Hz?