Zach, you might consider using the camera zoom trick in the AH film viewer to make the background subject bigger.
1. position your camera so the foreground subject matter is how you like it.
2. turn on zoom and use the [ and ] keys to zoom in/out on the background subject until you have what you like.
3. leave the zoom feature on and use the arrow keys to back the camera out to its position in step 1
this should help make your background subject matter larger and appear closer too, but be careful as you can over do the resizing and end up detracting from the foreground subject matter. For example in this screenshot I was able to make the background stuka apear longer and larger than the foreground stuka while I was adjusting it so I had back off on the effect, keep an eye on that kind of thing

I wish I had some before and after pictures to illustrate the effect but I never thought to save some before screenshots. Good luck and keep the screenshots comin'
