You won't get appreciably different results using DVE as you did with HD Benchmark, so I see no need to try it. Both discs have reliable patterns that help you set the basic picture controls to their optimum values for your TV and room.
The only thing that might improve the TV's performance further is to hire a professional technician to do a full grayscale calibration. However, this typically costs several hundred dollars, and in many cases, it improves things only slightly from the basic settings you've already established.
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