I'm guessing here, but those cameras look like either different models or different focal lengths. If that's the case getting them stitched together will be impossible. If it isn't the case it's still pretty much impossible to stitch them together without some serious post-processing. That said, you've done a great job to say the least!
They're the exact same model,
Amcrest IP5M-T1179EW-28MM, but they're mounted like this:
That's the view from where the coyotes are. Heres the closeup:
With that vertical gap between them, aligned to match up on a object 6-8' away, the parallax at any other distance is going to be significant, which is why the top of the combined image is so far off.
But this has me woolgathering a bit. The top-down view shows that the yaw angle between them is very roughly 80 degrees:
and there's a bit of a pitch angle as well.
But what if I mounted them opposing each other, e.g. straight up and straight down on that fence post, and then put a double-sided mirror, or just two thin mirrors, in the middle? Could I get optical centers of both cameras closer together that way?
I don't think well enough in 3D to be able to visualize how much freedom I'd have to adjust the angles and get the images aligned any better.