EFILive tunetool is quirky when it comes to correcting OOR cells, exactly what cv8r said above.

More info:
Fixing Out Of Range (OOR) Cells:
showpost.php?p=87052 post #14
showthread.php?14119-3000-RPM-max-and-setting-codes-03-Z06-with-Magnuson-at-150kPa posts #14, #17
showthread.php?14654-I-need-help-getting-the-most-out-of-my-car post#2