The F's can be tricky to play when they are relatively flat like that. Those can be the times when you try to force a trade rather than waiting for it to come to you, as Geaux says. Wait for the bigger set ups and scan other stocks for those set ups or don't play. That is my new rule for myself. I can see how you went in at that point as you were in some strong zones on several indicators, the bottom fell out on you at "the end of the day" not to mention on a Friday no doubt.
Have a look at the same chart on the FAS and see the difference. It might be a good idea to look at both charts while trading the F's against each other.