Thanks everyone for your help on this. The way I had stuff set up, I was achieving the rated thrust right near the top-end of the N1 scale. I will be shifting that all over a bit.
I'm working in a DC-10-30ER for FS2004 and FSX at the moment. Everyone's welcome to take a look at our progress at this site:
Your comments there are most welcome if you know a little something about DC-10s!
http://www.xsimulate.co.uk/forum/