As I understand it, the HII in SP1 'should' do a better job at matching the drivers to hardware. It sounds like you need to do the first few steps I outlined above and see what drivers are in ldddriverstore, then go to a machine that was images before sp1 and look at the same folder and comapre. My guess is the injected mass storage driver will be different. In which case, just go into the HII toolbox and 'exclude' the driver that is causing the blue screens from that hardware, or assign a specific, correct driver.
-Tracy