new to tuning

[ramboracer17]

yes im wanting to tweak some of the VHAE9J2 codes i got from hydra flash. I live in Colorado at about 6500 feet of elevation and really want to resolve low end overfuel and i think extend 3rd gear shift point a little. ive had the truck for a while and had been running it with the jelibuilt tunes and like them but i got a 32' trailer now and want to pull toys over the pass and go play in Utah or around the state. trailer loaded should weigh 15000-18000.
current truck state
stock ab code injectors
kc stage 1 gen3 cant get wheel sizes
Dorsey diesel stage 1 trans (modified valve body if i remember)
napa 6673 air filter want to switch to S&B to get temps down
6.0 trans cooler.

i want to get in and fine tune and maybe build my own file if i switch to single shots.

hopefully that makes sense and is enough info maybe to much info. in minotaur i was having a realy hard time finding the binary files(manage to load tunes from hydra flash) and could not find any files that would load into the definition. looks now like my demo mode is used up.