Yep, did the registry tweak, switched to AHCI mode, and optimized Win7 as much as possible for the SSD. Experienced a slight performance increase, but still showing a 7.5 WEI :-\
My recommendation is don't put any faith or worry over your WEI score! It is not a true measure of your systems performance!! Only way I would even think about being worried is if you got a 3.0 WEI score or something.