I think you missed the big picture. One of the primary reasons to delay S.S. to age 70, is that you get to spend even more between 62-70. The reason for this, is that because you have a larger amount coming in age 70, it frees up more assets in your portfolio.
If you start looking at delaying SS as "Old age insurance" instead of meaningless break-even analyses, it will make sense to you. Because it's not how much $$$ you pile up, it's how much you get to actually spend. It's like a Super good deal on an annuity.
Go over to Bogleheads, and search their forum for complete explanation. There are a lot of smart people over there, who have done extensive research on this topic. Bill Berstein, who wrote "The Four Pillars of Investing" posts over there. He is a Major Proponent of delaying SS to age 70. Especially in these times of Historic Low Interest rates.