monitor resolution - size of desktop icons

Right-click on desktop - Configure Desktop - Display - Screen size. I changed screen size from 1280x1024 to 1024x768 I noticed that a desktop icon (measured from top of icon to bottom of text) changed from 2cm to 2.65 cm. This seems like a rather large change. I'd kind of like something in between. Is there another setting that affects the size of desktop icons?