Below average Firestrike score on GTX 1060 3GB and overclocking issue

May 17, 2018
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I have a Zotac GTX 1060 3gb AMP Core edition with a firestrike graphic score of 11.800-12000
Aint particularly bad, but im one of the lowest in my tier
I've seen people with 12500 - 14000 score, granted they're overclocking their GPU to an extend. But here's the problem, my firestrike always crashed if i overclocked it. Mind you this is a tame overclock of +100 core and +200 memory, with a total of 2025mhz on core and 4050 on memory. but firestrike crashes everytime, espescially during the 2nd graphic test.
( did'nt even touch the core voltage )

I've tried overclocking with Valley and Furmark and it turned out okay
With 10 minutes on furmark my GPU never even reached 70c with +110 core and +250 memory. The crash seem to only happen with firestrike. So im stuck with my 1860 - 1930mhz stock boost clock and i have never reached more than 12050 on my graphic score.

I've seen a guy with almost the same exact GPU, CPU, RAM and even the same OS got 10% more on their overall score, even the clockspeed of both the GPU and CPU are the same as mine, but yield different results, granted he's using an SSD and a perhaps a better Motherboard which i dont know if that has any effects on the result .
so can anyone tell whether there's something wrong with my system or did i just simply lost the silicon lottery?

My PC:
Gtx 1060 3gb
i5 4690 3,5ghz
8 gb of ram
Enermax NAXN 500w PSU
Win7 64bit
Overall firestrike score: 9050 (https://www.3dmark.com/3dm/26739369)
Sorry for the broken english too
 
May 17, 2018
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*UPDATE*
I've managed to get 9200 overall score which is average
But one thing i've notice is that my graphic score is only 11.600 which is lower than ever, i've tried and managed to overclock my GPU without firestrike crashing (apparently i have to crank the core voltage all the way up) and get 12100 on the graphics score, but this time the overall score dropped to 9000.

Does this mean my PSU/Mobo couldnt maintain a constant voltage across the board?