Thats got it..
Anyone who doesn't do this has rocks in their head, the font rendering is SO much better. Thank you for your patience bra|10n.
One thing I did find is that I had to set the dpi to 96 (as I have it forced in my fonts) rather than the reported 144. I found I have an issue with the twin nvidia monitor setup in that if I don't force the font, when I connect the second monitor the fonts become huge for some reason (there fine on the laptop monitor alone).