Thats a lot of balls and a lot of golf, rather than immediately assuming it is a biomechanical issue, have you wondered whether your body is responding to over use?
__________________ The student senses his teacher’s steadfast belief and quiet resolve: “This is doable. It is doable by you. The pathway is there. All you need is determination and time.” And together, they make it happen.
City,
I'm with GP. Last year I did the overuse thing and frayed the labrum in the left hip.
Less can be more by doing drills without balls. I also find chipping and pitching with balls, instead of full swings on the range, help greatly in securing the alignments and feels I happen to be working on. When I think I am on to something, I may head to the range and go through 20-30 balls with several clubs to see if I am on to something. I really believe the wedge and putter are our best two practice tools.
When you get here, we'll camp out on Kev's front step and work on this stuff. I can hardly wait.