Imported these in KotorBlender and re-exported. Let me know if it did the job.
These models seem fine. The only thing out of order was that root object name did not match the model name. Artifacts you've experienced are more likely caused by skeletal animation (QBone/TBone), not name mismatch or vector compression. Luckily, this is what KotorBlender also does better.
xbox_models_fixed.zip