My issue is that the displays I got are not working quite right, there are white bars on either side of the screens, which I'm concerned will make it difficult to see due to the light bleeding.

Originally, I thought this was due to improperly configured hdmi_timings, so I reached out to the manufacturer to see what values the displays require. I haven't heard back, but I realized something that made me think that wasn't it. The white bars are present on the 2" tft display too...

I think the borders of the screens simply aren't being updated after the stereopi logo loads, since the cameras are only outputting a 16:9 image, whereas the displays are forcing a 2:1 ratio.
My question is this, is it possible for the pi to stitch together two 720x720 images instead of two 720x640 images? I'm not sure how I would change this, or if it's just limited by the hardware itself and impossible.
If it's not possible, how would I fix the white bar issue to turn them black to limit the light bleed through?
I have about a thousand more questions, but this is where I'm at right now. If more info is required I'll do my best to provide it. I appreciate any help ^ ^