Don't have to know much about anything to see which swing has a HR chance It's made possible by the lateral bend. It doesn't matter what you are swinging. The elite players will all have the right upper lateral bend of the spine. Some folks just instinctively start swinging this way. For most though, it's more like the over the top swing of the first kid. So you have to learn that movement...first you have to know the move exists...

The overhand drill will invite you to find it. In that drill, you will quickly learn that you feel no real power or accuracy if your flip/slap at the ball with your right hand. This is where the snug upper left arm finds its balance to work in harmony with the pronation of the right wrist.

It should force you to come into impact from a shallower and more inside approach.

During the drill, let your right arm and wrist bend and fold naturally...envision Ben Hogan's drill from The Ed Sullivan Show while doing this.

When you go back to your proper golf grip you should seek to implement the pressures and pressure points felt during the drill into your normal swing. Try to mimic the right wrist pronation and right elbow location. You will need a flat or bowed left wrist to accomplish this. You will also need a more (probably) proper/functional pivot movement of the lower body.