Reply to Latency: Audio 8 Vs Xone 2D

Something that has been puzzling me, when I had my Xone 2D I could run traktor with 4 decks and have a total latency of about 12ms with no problems. Now that i have switched to an audio 8 anything lower then 20ms total latency causes mad audio problems (popping, stuttering etc.) Anyone know why this is or how I can get my Audio 8 to the same latency?

Some Info:
Audio 8 driver version: 2.0.15.007 (anything new causes all sorts of audio drops)
Traktor 2.01
Windows 7 64-bit
Core 2 duo 2.2 ghz
4gb ram