I think today's NFP was a wake up call to those who were disinterested in USDJPY for the past 6-8 months. Therefore, although it is difficult psychologically to add to trades after a big run up, that is itself one reason why its profitable to do so when the reasoning checks out.
I have added around here and will do so in small every 50 pips on the way to 1.24 initially and ultimately up to 132.