I have been struggling with similar issues. It appears HII is not injecting the drivers even though it completes with success. I have attempted to assign drivers to certain models with no luck and have tried different drivers and versions. The end result is a blue screen with error code 0X0000007b because it is not loading the hard drive controller driver.
Update: Finally figured out that the new version of HII can't deal with old HII material left over from image creation or reimaging. Ended up adding a provisioning task that deletes the \Windows\LDDRIVERSTORE file on the hard drive before the HII task. HII loads the proper drivers and all is well again.