What concerns me with this style of trading is that quite often, there is really only one major direction for the day, yet we spend an enormous amount of energy chasing the wiggles.
For example, today a couple of us successfully shorted the top and reverse just after European open. If I had held on until now, returns would have been great. But right now I'm looking at a much smaller return for the day. I've found that this holds true for a lot of trading days.
Not sure what to do about this at the moment, as in theory returns are optimised when you trade long and short throughout the day. This is very difficult to master however.