I don't care that it's a week late, the important fact is that you managed to do it to the best of your ability! Strong work, and I love that you still go through these challenges. I sincerely hope that they continue to benefit you in the long run, and that you'll be able to improve your balance.

I know that balance was a significant issue for me when attempting one-leg squats, but in my case this was due to imbalance of strength in small muscle groups - your imbalances may related to your medical conditions, based on your prior experience with leg exercises. That's much more difficult to fix, but you seem to have the dedication to improve it. Either way, keep up the outstanding work!