If anyone is interested, i solved the problem of measuring latency.
I had to move outside of the scope of user-mode DirectX.
The solution was injecting "D3DKMT_SIGNALSYNCHRONIZATIONOBJECT2":after presents.
http://msdn.microsoft.com/en-us/library/windows/hardware/ff548357%28v=vs.85%29.aspx
It sounds off topic for this forum so i won't go deep into the description.

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