Guys, Finally I've solved the problem











Remember what I've said in this post:
Guess what. I've replaced the cable with the one I've ordered from iFixIT
http://www.ifixit.com/MacBook-Parts/MacBook-Pro-17-Inch-Unibody-Hard-Drive-Cable/IF162-015
I've ordered last piece (lucky me) but you can search for apple part number.
My machine now running on Sata III and the speed just amaaaaaaaazing. No freeze, no beach balls, everything really smooth and faaaast. I've decided to stick to Crucial C300 since it was faster than Intel 510. Maybe I'll use intel in Opti-bay once I get the HDD enclosure.
Back to the cable problem, Note that This cable is different for each model size!!.
To help you guys (with 17" only), I've taken a picture of the original defective cable:
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And this is the one I've ordered from iFixIt and working with SATA III (I think its for 17" 2010 model)
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one thing, I couldn't open one of the screws. It was really tight that I've damaged the screw, check below pics:
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so I had to use a cutter and just cut that small part of the original cable to be able to install the new one. Original cable still working fine but I hope you don't face this problem.
Finally, some pictures from profiler and benchmarks using QuickBench
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I don't think a software update needed, and Apple will never acknowledge this problem if it is really hardware related.
For me this is what worked out for both intel 510 and Crucial C300
Good luck