How to Decide When to Tinker With VWAP

Howard Kurtz: I'm a swing trader. That's how I define myself in the market. So tell me what that all means again. You put your little Brian Shannon magic test on top of VWAP. How do you decide when to tinker with something? He says, "What I like to do is go to key inflection points in the market" When it's working now, today's July 16th, the June 29th little pullback in the S&P 500 has been magic. Two times in the last week and a half, it has touched it perfectly,. Then just ripped 3% higher from there, two times in a row.