That's awesome to hear about your success with the overlap (Vardon) grip! Switching grips can make a significant difference, especially if you're experiencing discomfort, like with your right pinky finger. It sounds like the overlap grip helped you keep your right hand more passive, which can lead to a more consistent swing.
Aside from reading guides, it might also be beneficial to consider other learning options, such as taking lessons from a golf coach. A professional can offer personalized advice and feedback to further refine your technique. Keep up the great work on the course!