ImageW requires that you redeploy an image back to the same size drive or larger. You cannot deploy the image to a device with a smaller drive. It is a sector based capture tool.
I always use a VM with a 20 GB drive to build my image and then I can deploy it to any device in my environment.
ImageW is a sector based image tool so it is a duplicate of the structure so can't be shrunk.
As long as you are building images from a recent enough version of windows you should have no issue using drive management to shrink the main partition.
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