I have a 2016 GMC sierra 1500. 13,500 miles on it. I have severely studied this topic and figured out it is torque management. One thing that seems to help me, though it is a sacrifice, is turning off traction control. It takes the limiter off of your RPMs and takes a lot of the hesitation and delay in acceleration out. If you want to completely fix the problem without having to do this, buy a tuner.