In all of the things that you've tried, have you tried Powerstrip to raise the latency of your PCI bus? I did that on my KT3 Ultra aru with a 19160 and 3 X15's softraided in XP Pro and got Atto's of right around 20 before Powerstrip and 75 after! Google it , download it, find the icon in the sys tray, right click the icon and choose options, adapter info. In the lower right you'll see a read only box, uncheck it and then, using the little arrows in the upper left, scroll to your 29160n card and check it's latency. Change it up to about 128 or so and then re-run the atto's. It sure helped me!