FC,
I have toyed with the Boll-Bands over a couple of weekends.
What I have found is that just because the upper-band is hit, doesnt mean it will bounce back to the lower band.
( even BunnyGirls strat is a bit vague on this )
I have found it hits the upper band, and then goes sideways. I start getting fidgety whether it is going to fall eventually, or carry on upwards, at a slower pace.
But, if you hang about too long, the lower band catches up, and your potential reward diminishes.
( also reverse for when falling )
As an aside, have you noticed how the Pivot Points also act as bands.
Yesterday, for example, the GBPUSD rose and spiked the R-1, and then fell past the Neutral Point, and fell onto the S-1 point ?
EDIT: above line origianlly had R-1; obviously should have said S-1:
PS: I am toying with the idea of NOT trading if the price is around the Neutral Point. But to take more notice of indicators, such as RSI, or ADX, when it nears the S-1 or R-1 points.
I am basing this on the rather spurious observation, that there appears to be a lot of "bar" noise at Neutral Points, and thus results in whipsaws. And the indicators seem to have lower noise ("clear air" )when at R-1, and S-1 extremes.
Hope the above helps.