Okay, I apologize for getting back to this sooner. Just for background information, I've been using a Tactrix OBD-2 with the ECUFlash interface:
Tactrix
I might just create a thread with an overview of everything that I'm doing and then create separate threads each of the specific changes and their results. The one thing that will probably need to take precedence over most of the engine tuning is aerodynamics. I've found that this engine is extremely efficient when at low loads, but getting to those low-load levels at highway speed is going to require some adjustments. Anyway, more on that later!