Do you concern yourself with imbalances in your feet only?
Eyes closed is good. What about inner ear balance? Core imbalances? What are some other ideas for balance improvement?
Do you like Bosu balls or balance disks? Foam rollers? Eye restriction?
I have noticed that my balance in my golf swing has improved as a result of doing squats in the gym. When I started doing squats my legs were bowing in under the strain which is a no no with squats. As mysquat form improved I found that my balance in the swing improved particularly when hitting from awkward lies. I think this has something to do with subconsciously learning to balance and hold the weight bar throughout the squatting exercise .