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The best drills are just going through your swing sequence slowly and repeating the proper movement. For the head dipping, which I have had, I worked on going from A1, setup, to A4, top of the backswing, with the feeling of stretching my right side as much as I could. Feel like the right shoulder is going as high as possible and your shoulders are turning as much as possible. Add to that the feeling of your arms being as long as possible with the right arm being as straight as possible.
Do this in front of the mirror if you can. You can even do it without a club. See the video below (@sk golf). I use the first parts without a club to get the feeling.