Monochrome
Looks like none of your mods require a custom tune so if you like the canned tunes just stick with them.
First thing you need to do is read the manual.
The tranny tune, as Tico said, only modifies the transmission's shifting strategy. It does not make any performance changes to the engine. This tune runs on 87 octane.
The tow tune modifies both the engine and transmission strategies. It is the tune that most people use as their daily driver because it has noticeable performance gains while still being able to use the lower octane gas.
If I were you I'd try out these two out because they do not require any higher grade gas.