Glad you are here and you will improve. First... you have a lot (many of us do), of old thoughts. Try to let go and when you practice, stay focused on one drill... even the same drill for a couple of sessions. Give your body time to learn and feel the drills. I used to put down "Flash" cards on the ground, for myself to stay focused. It helped develop discipline.
Now, it appears that you're not setting up with 60% (or more) of your weight on the front foot. After you do, you want to learn how to "stay" with the weight on that front foot as you use your shoulders only on the backswing... NO SLIDE OR SWAY to the back foot on the backswing. I know that is not what you heard from all the (well intentioned) pros, but I found loading up that back leg is the worst thing that can be done for repeatability. It is like moving the center of a pendulum. It is hard enough to hit the ball... now try to hit it while you're moving back and forth... I don't think so, at least not very often. So, practice the Front Foot Drill or the No Sway Drill. They will feel awkward at first, but you'll soon get more coil in your back muscles for power vs. slide and lift. Also, once you've finished your backswing, you will already be on your front foot and it will be very easy to use the "hips" or unwind. You can't unwind if more than 50% of you weight is on the back foot... that is why you're struggling. Thanks for joining the forum nicholbran1219
Move Less ... Get Good! DUPLESSISGOLF