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The issue seems to have been my textures. Out of the box, they were .tga files at 4096x4096. I converted them to .jpg for the USDZ process, but kept them at the same size. After creating this thread, I scaled them to 50% and compressed the .jpg files to "medium" quality. This didn't bring my file size down too much (1.2 MB), but all of my devices are happy to display them now.