Sounds like the left knee might be giving you some trouble. As the posting leg for the workhorse, it is important, but I have students that I have taught to work around it. The key is what is the pain and mobility. Everyone is different, so I have to see it. You mentioned the backswing is very erratic which can lead to some inconsistencies, but I can’t help but wonder if you are applying the 5 Dynamics well which will give you your greatest margin for error.
