@TeamWinMiner: Is mining ETN optimized well for the CPU?

When I mine ETN in a pool with xmr-stak, it says 320 H/s for the CPU. Winminer uses ClaymoreOldCryptoNoteCPU according to the jobdecision in settings and it says there 295 h/s.

Another question why winminer says 261 h/s in the mainwindow mining ETN on CPU?

thanks
Lajos