Configuration is ok, dstm is close source and it looks it have in code written to show 3% bigger hashrate as is the actual real is. Even on my test pool dstm show 460 sols on local pool real 446 Sols/s. Ewbf 473 sols on local pool real 471 sols.
I was testing that couple of hours it looks just another developer want 2% but his software is fooling miners and showing inaccurate hashrate.
For me is important have real hash rate in software => pool. And that at moment fulfill the EWBF