If you have the time to monitor the 4 hour charts you could maximize your profit by shorting the pull backs with a half position and buying back once it returns to where the pull back began.
This same play is happening on most xxxJPY pairs, but I like the AUDJPY pair only because the pip cost is the same, but the margin requirements are a few dollars less.
SL @ Floating adjusted manually on pull backs
TP @ Manually - Will wait til closer to the end of the week and see how far we moved and how quickly.
There is so much downside it won't hurt to bank my pips now and wait and see.