Maybe a silly question, but do you use the wizard to inject drivers or are you manually doing this? I usually do not rely on a wizard, but grab the WIM and:
- Mount it;
- Inject drivers required;
- Capture with max compression again (saves space);
- Unmount and use the captured WIM.
Since 6.8x times I had issues with the wizards and stopped to rely on that as manually injecting drivers usually works much more reliable here.