400hp magnum on DPI

Can you please elaborate on the various aspects of what is configurable on the Holley ECU, and how a novice EFI tuner would know how to take advantage of this configurability?
Also, do you use a laptop to change the configuration?

The reason I went with this factory ECU based set-up is it is quick and easy, it's plug-and-play and the performance difference is amazing between the factory tune and the custom tunes. I just plugged my tuner into the OBDII port, reflash a new tune into the factory ECU and it runs great.

To fully optimize the tune a wideband is hooked up, I shoot a video of the wideband readout while driving the car, send the video to the tuner via email, and he makes some adjustments and emails me back a fresh tune that I download into the handheld tuner. If necessary, this process is repeated until it is optimized.

This was the least expensive EFI solution without compromising performance and tunability. I ran this same system on a bone stock 5.9 and reflashed it to run my ported aluminum headed 408" stroker motor with a much bigger cam and injectors. I didn't have to struggle with the learning curve for tweaking Holley's fuel and ignition maps, and who knows what else. I know some guys like the process of trying to figure this all out, but I simply don't have the time or the desire to get that far down in the weeds with it.

I seriously doubt there is any performance gain to be had from my current configuration, but what do I know. I'm not trying to shave tenths of my quarter mile times or anything. It's just sounds like more work to me. Another upside is I can get off the shelf parts for my system anywhere in the US.