My point is GB that intraday futs trends are very rapid. Most moves are over in a few 5 min bars. Even the real big ones that are very rare will print 3-4 15 min bars in the same direction and throw you off the trend. You need a promising system first then help it out with a filter. Step 1 is the hard bit.
This is why I think Al Brooks methods are mostly BS (trading off 5 minute bars). By the time you are on to the move using 5 minute bars it's just about over.