I wouldn't argue against the lines drawn above...There are "typically" reactions at levels such as you've drawn above...The bigger issue is that when you have the VIX down in this 11-12 range, the reactions aren't significant enough to give you "breathing room" away from your entry...Look at that 2180 level...sits there within a 6-8 tick range for several hours, breaks a little bit below and then it's right back up there again...OTOH, when there is a "catalyst" (i.e. Fischer doing some verbal intervention post Yellen on Friday), it will cascade thru a series of levels with hardly a breather (almost binary)...
I'm also more a fan of channel lines rather than horizontal S/R...Oftentimes, you will find the market making marginal new highs and lows that penetrate the horizontal S/R, but are exact touches on a channel.