If I look at your armory you have 350 hit rating that means that HIT value is 0 for you.
So you compare 65 haste with 4str+28crit
According to the compendium, this should be
65*0,5640 compare to 4*2,5570 + 28*1,1453
36,66 EAP to 42,2964 EAP
Those are very close number, as your 10 more DPS.
And also, on the compendium there is this note :
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Keep in mind this is vulnerable to change as we are still building up the theorycraft around gearing a Death Knight. Use this as a guideline, rather than all-to-be-guide.
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Maybe you could explain a little bit how you have test your DPS change. If it was 5 minutes on the 80 training dummy or 1 hour on the l83 dummy. I would also add that 10 DPS is a very small variation to established fact. This is about 0.5% of your DPS