Hmmm. Probably better to short Dupont as a pure play. Pretty much an identical chart, I just think DD would move down faster in a down market environment. (Beta 1.44) Plus they have the whole DOW merger thing in the works, albeit I haven't read up on the current goings on of that in awhile, but that could always throw a wrench in the works I would think... So imo, if you are thinking the time is right to short this... go with the Dupont short.
I gave up peeing into the wind for the most part. Life just seems better, and is more profitable for sure. Maybe you'll miss the move if you don't jump on it right now.