I had the same experience with the stiff DCCA cords. Don originally sent me two Extreme Reference power cords, and I returned them the same day because I couldn't install them.
However, Don then offered to make me a custom cord at a specific length including a crucial 90 degree bend and exact orientation of the plug and EIC connectors. Don's customer service was extraordinary, and the resulting cord is in my system powering one of my Hydra 2 conditioners.
The custom cord also included Don's MBG, by the way.
The moral of the story with DCCA cords is...they are very, very stiff, and therefore a custom cord is probably the way to go. Don will happily fabricate a cord to your specifications.
Terrific cords akin to Elrod EPS3 Signature, IMO, and worth the extra effort.
As with all aspects of this hobby, YMMV.