My buddy beat the hell out of his transmission with Cobb's TCM flashing for 30k miles without issue, and he was at 552/579 on 93, 608/662 and E85, and never hesitated to test out launch control
That was his blue 2013 we drove up for the MitsuStyle Cruise last year. He's since traded that one in and swapped all his mods over to a white 2015. For transmission maintenance he did nothing but frequent fluid changes...keeping the fluid fresh in those things really is they key to longevity; I think he may have added an aftermarket filter as well. We'll be caravaning up for the Spring Cruise in April so you'll have to be sure and connect with him.
Here are his charts:
These engines are very potent and respond insanely well to modifications.