Trans tuning help

So I have a 2014 Cadillac XTS and a 2015 2500 HD Sierra with a 6.0, I absolutely hate how both of them shift, I've played with HP tuners before but only on the older PCMs, when I pull up a lot of the parts to change transmission and even engine tunes on these newer ECMs I get completely lost and hear horror stories of things getting really messed up, is there someone in here that I can pay to take my files modify them and send them back to me? Obviously someone that knows what they're doing and isn't learning like me, I just don't have the time to dedicate right now to learning this whole new platform

Post up your Tune Files

What are you wanting, Firmer shifts?
For stock vehicles a few PSI increase and a little less commanded shift time does wonders.

order trans booklet from tuning school, not many people are gonna help you on this forum