NFV goes out at 1087.65. SPX at 1079.38. That is > 7, and has some edge to long side. However, I am going to suggest that instead of using 7->14->24->35->etc the way we do when SPX is running above NFV, that we change to a more conservative chain of 14->24->35-> etc when SPX is running below NFV. In other words, ignore minimal edge when markets are swooning.
Markets drop faster and harder than they go up, and the asymmetry is warranted caution, imo - it reflects the reality of market dynamics. However, there will be traders that have no fear and are well capitalized and will continue to use the same unit-add-point numbers to the downside and upside.