You sound like the way I was for over 20 years, although I did not change my swing as often as you do.
I tried a lot of instruction books, videos, lessons, and experimenting. I finally found some instruction that worked well for me in a book called "The Golf Swing And It's Master Key Explained" by Noel Thomas. However, I do not know if this instruction will work for you.
One thing this book taught me is the importance of having a swing reminder list. It provides a reminder list in the back, but if you use some other instruction, or a swing you have developed on your own, then make your own reminder list of things you must remember to make your swing work.
I take my swing reminder list out and read it before each practice session, and before each round, and any other time if I feel my swing is not quite right.
