Hello MZ Skeeter,
I use Glass Eye, whitch is a stained glass design software. There is no plotter calibration in it. I have in the manual of the plotter a page where X/Y axis compensation mode is explained but it does not apply to my model because I do not have the same control pannel. Here is a copy of the manual: you can see that the control pannel is different of mine...
Until now, I simply resize manualy my drawings before plotting, but it is quite "unpractical"...