This is due to how X-Plane handles 3rd party windows (versus their own). We are writing a config-file based library which will allow setting specific screen coordinates to render to, but until we have that working, attached is a hot fix. Inside the zip you fill find g1000_nobezel.png inside. Replace the file with the same name inside X-Plane 11/Aircraft/X-Aviation/M20 Collection/M20R Ovation III/plugins/m20_systems/resources/g1000/data (and same for M20TN Acclaim folder). This is simply a transparent image that is resized so the proportions should act better.
I haven't tested with emuteq G1000s before, only with RSG G1000s, so the display resolution may be different on these screens (RSG is 1024x786). You can try resizing the attached image if you still experience the cropped effect on the G1000.
g1000_nobezel.png.zip