The Chinese must have read your idea, as the market started tanking around 10PM at about the level you suggested. I got short at the open and stayed in with little scaling until it got close to 75 when I closed the trade. About a 20 pt trade of which I got 50%.
That area is certainly one of importance as there is a trend line leading into the same narrow band of confluence. I expect volatility on Monday and Tuesday but starting higher and not going quite as deep as you suggest. Good idea though and thanks.