Macbook Pro 13" Mid 2014 disk defect?
Well if it is not the state of you disk it could easily be just a different SSD vendor. Those figures you have provided are from testing SanDisk 128GB equipped ones.

Apple has many different vendors for same part and some SSD chipsets are faster at sequential than other. It might just be the case. Here is an article on similar discrepancy over 2013 and 2014 MBAs


  For many years, Apple has used different suppliers for the solid-state
  drives (SSDs) in its MacBook Air models, with drive performance
  varying among manufacturer brands. A recent study by Macworld
  demonstrated rather dramatic differences in SSD read and write speeds
  between tested 2013 and 2014 models, but at the time it was unclear
  whether the poorer performance for the 2014 models was still simply
  due to drive brand variances or if there was something specific to the
  2014 machines causing an overall degradation in performance.


If it is the case then what you can do is either sell it and find SanDisk equipped one or bring it back to Apple if you are in 14 days window (you would have to pay restocking fee though. No you can't claim that you are not getting performance you have paid for because Apple is only advertising its performance as “up to” figures)

On the other hand if you are not working with high def video on this machine and SSD I wouldn't bother since those sequential speeds are only good for that. And that tool is from company that is creating pricey tools for movie production btw.