Is the Bollinger Band really supposed to be used like this?
As i would always suggest: backtest it by yourself and see the results 
Did you set up the candlesticks to 30 or 15 Minutes? As this would effect the graph.
To look at the Bollinger Band in this way, the candlestick period must be 5 minutes.The EMA strategy, instead, must be used with 15 minutes candlestick.
~Gun