I had a 12 index a few months back and it is now up to 14 - just updated my profile to reflect the down slide. I had a back sprain which I've suffered from doing a yard work. It screwed up my swing form completely and my GIR average when from 6 to 3. Now, I can't seem to get my swing form back although my back is completely healed.
The lesson learned? Don't do any yard work !!!