We had almost exactly the same situation way back when we submitted our EOI. OHs degree in Electronic & Electrical Engineering, claimed points for critical skills shortage (IT Project Manager) & degree but because they didn't match up they took off the work experience as a PM dropping us below the threshold. It took a job offer to get us to ITA.
Some of the info on these threads might help, my OH is mgbridges:
http://www.enz.org/forum/showthread.php?t=31784
http://www.enz.org/forum/showthread.php?t=16386
http://www.enz.org/forum/showthread.php?t=13640
Good luck
Mrs. B.