I think, head above the parapet here, your index relates to your handicap relating to the baseline slope which I believe is 113. By the time you amend your index to take into account your home courses slope your handicap is back to where you expect. You will only play to your index at a course that has a slope of 113.That's the question I was asking a while back but never got a proper answer, if someone comfortably plays off X handicap at a course, how can they suddenly gain shots?
Please, no abuse from anyone if wrong, just correct my explanation. I haven't read this, just how it looks to me.