Hi vukomir, I was wondering if your issue could be similar to the one described here: Offset/Alignment @ 4K Cluster
You may also try testing the Intel® SSD in a different system if you have the chance.
AS SSD Benchmark seems to show the partition alignment is proper. Could you post ATTO Benchmark screenshot? Check if the NTFS file system compression is enabled - file system compression can give that odd benchmark results.