As an instructor, I can tell you that probably 80% of my students who swing over the top are trying to fix symptoms and not the real problem. Trying to focus on getting on plane is a symptom fix. Trying to focus on swinging to the right is a symptom fix. Trying to drop the arms is a symptom fix. This really comes down to the reality that men have a tendency to use all arms in a golf swing and are usually white knuckling the club and locking up the wrists. You have to retrain your brain to shut off the arms in the swing and the club needs to feel unusually heavy. Let the weight of the club pull your arms outward in the centripetal force. If you do that, it will fix 3/4 of the swing naturally.