The only way you're going to get the high score is buying a Solid State Drive. My graphics score is 7.5, ram is 7.5, but my HDD is 5.9 which makes the total score 5.9. At the present time an SSD, to me, isn't worth it. I could care less about the WEI score, and my HDD's are doing what I need.
As Tews said, if your computer is doing what you want and need, there's no problem.