Not bad for first attempt. Nothing wrong with the DX58SO. I had one which would do 219Bclk on a C0 stepping 920. Volts are a tad high, maybe drop it to 1.35 (within intels whitepaper specs) and drop you speed to 4.0Ghz. What is your QPI or VTT voltage at?
What ram are you running, cause you can definately get more out that, and the NB is obviously a bit slow cause of the slower ram speed. Up the ram multi a notch and just remember to keep your NB/Qpi frequency= 2 x ram frequency.
Edit: I see you got a 950, drop you Bclk and up your multi to 23, might allow for a slight voltage decrease.