I think we should try to find a kext other than Natit or EFI strings, to produce better QE performance.
So far, no success. I've tried NVdarwin, NVkush, NVinject, but all of these kexts gave me no QE at all.
Please keep us updated if you have any results.
Meanwhile, I have totally changed my configuration, hardware and software.
I don't use an Epson scanner (I switched to Canon), I am not using Tiger, as I used to (now I have Leopard) and I am not using CS2 (now I have CS4).
I have even formatted the hard disk I had when I started this topic, so I cannot help georgeorange. Sorry!