My new Intel 520 240GB also only reports 5.9 for Windows Experience despite it having the latest firmware, running the latest Intel SSD Toolbox recommendations and having AHCI enabled.
What else should i be doing???
Are you running with discrete or integrated graphics?
If you have access to both, capture your WEI score each way and post your results.
Why are you using the "-hybrid" option? Is your 520 part of a SRT system, which would be impossible in AHCI mode, so I'm confused. I can't find anything about "-hybrid" at MS's site, but winsat recognizes that option. Winsat won't accept it on my PC.