Yes, I installed the Hypertech Max Energy in my 2012 Silverado LT 1500 5.3, when I did I also changed the shift firmness.
Here is what Hypertech says about the shift firmness settings.
Increase shift firmness to maximize performance or when towing, to reduce clutch slippage and transmission oil temperatures. That means longer transmission life. However, this feature must not be used If you have installed an aftermarket shift kit.
I must say, the programmer made a huge difference in my truck.
2015 Jay Flight 23 RB
2014 Silverado LT 1500 with a 5.3 V8 Ecotec3