Came across a thread in the G30 forum about native support for fullscreen CarPlay. Did some more research and found someone who activated it for me.
So much better than before when CarPlay was only using 2/3 of the screen!
If anybody is interested in getting this activated, send me a PM and I will connect you with the person who did it for me. The process was very easy and straightforward and cost me around $100.
Edit: Unfortunately, the guy I used for this mod is no longer around. But doing some Google research it appears there are various vendors now offering this mod.