Correct Plotter Cutlines in Illustrator

I have a set of very small vector pieces that need to be kiss-cut on a plotter, but the cutlines keep scaling unpredictably when I export the file. I’m currently amending vector artwork/paths for sending... (Budget: min £36 GBP, Jobs: Adobe Creative Cloud, Adobe Illustrator, Adobe Photoshop, Graphic Design, Illustration, Illustrator, Photoshop, Vector Design)