Alienware 17 R2 - Slow M.2 SSD?

I just got a new Alienware 17 R2 laptop with a standard 1TB hd.  I installed a 480GB Crucial M500 550MB/s SSD the other day, but I'm only able to get half transfer speed.

I have installed the SSD in the first M.2 slot and have spent hours researching and tweaking every setting per many suggestions on google.  Nothing has worked and I have not been able to get past 250MB/s Read and 230MB/s Write.

*Edit

I imaged my windows install onto my SSD and then restored windows, so my SSD is a bit offset.  I'm not sure if SSD misalignment can cause the performance to halve or not.  

Here is my benchmark: http://imgur.com/Z3rS7jl

Any suggestions?  Thanks.