Agree with you. I don't like the dailies. As of now, the classic parabola doesn't seem to be present, which was there from 17th to 24th Jan. So currently, the whole premise of the trade is questionable. Watching closely - had I been trading OPM, I would have been out with a timestop of 15 days. But its my own money and risk is low (currently), so watching as of now.
If you're going to be a fool enough to short the yen, at least do it against over valued currencies like the AUD or EUR. Don't do it against the USD, which is due for a rebound very soon. You'll only add to your death dance.