I tried to get Sam from AMP to tune my car but he kinda just blew me off. Perhaps because the car was already worked on by another shop. My cars currently tuned by Matt, and I'm in Houston as well, but getting work from the fastest is an alluring idea.

^^^ this.

From the look of the graph, baseline torque was on its way to 540-545-ish with a proper reading, so your increase from the Roto-Fab is not as phenomenal as it looks, to say the least. 15-20 hp/tq at best, the same everyone else has gotten since 2017 or 2018 ;)