Edge Issues: Displacement Registration

I have been trying to register the images attached via the displacement registration method provided: Image Registration Method Displacement 1 — SimpleITK 2.0rc2 documentation

However, it seems that the edges of my results are flawed…Does anyone have suggestions for how to fix these issues I am having at the corners?

I have tried increasing the gaussian smoothing variance, and that has only seemed to help a little. I also tried to pad the images with a black border to see if that would help, and it did not do anything.

Any suggestions are welcomed! Thank you

ReferenceImg.tif (256.2 KB)
DeformedImg.tif (345.5 KB)

Edge Issues Output Image (Resampled w/ outTx):
RESAMPLED.tif (1.3 MB)