That is some serious awesome! I'm stealing that!
To expound a tiny bit on WHY Alpha-N(throttle position based fueling) works better with ITBs(individual throttle bodies) than a MAP(manifold air pressure) sensor:
With ITBs, once you open the throttle plate beyond 10-20% there isn't a real good vacuum signal as it is pulsed every time the intake valve opens for that cylinder only.
The MAP sensor relies on a stable vacuum source to determine fueling. This works very well in single throttle body situations, and works better with more cylinders and especially with a big plenum in the manifold. Stable vacuum is VERY important.
Once I get mine dialed in as good as Mike, I may play with adding a second fueling map to add/subtract(blend) with the main fueling but only at small throttle openings as in cruise situations.
Mike, can I borrow Marianne? Barring that, I'll have to log the data and tweak later...