at the first place if one is sure of getting 5 pips, there is no risk in taking it. Rather one may go for a bigger trade to grab it better.
There is no guarantee that the PA will move in the desired direction even upto the extent of 5 pips, how can we say that we are sure about 5 pips.
On the other side, we with the system followed properly can have a justification of getting 5 pips.
My view
fxmyluv