Up power on chassis cab diesel

The 6.7 chassis cab needs more power. I use to be a ford tech and i know that the epa has the chassis cabs in theh ringer, but this has less power than the 6.4. I own a 2014 chassis cab and plan to buy more but i would would be alot happier if my new trucks had more power. You have done a great job with making a good truck but lacks power, especially on pick up at freeway speeds.