Why does your boost VE table drop by 100 at 285 kpa?? This could be the problem I think. I've done this by forgetting to select the last row of a table while editing before and pulled my hair out trying to figure out what's wrong.... I imagine the PCM is trying to compute airflow at 14+ psi with the 0 psi VE numbers in the 285kpa column of this table....
Also, what setup are you running? Just curious because it sounds/looks like you are very similar to me (2001 Z06, 427 C5R, PTS twin turbo, 60# injectors, etc.)
Derrick