Many thanx, it works and it is a very useful option! 

Hi Ping! Your pool is nice, but for my 740h/s it sets too much target difficulty. The difficulty automatically grows up until 100 000 and my miner can not find share and miss 5-6 jobs coming from pool. One share per 3-6 minutes. I guess 32556 is the right difficulty for my hadware to find at least one share per job. Can I fix this difficulty for my miner someway? Or maybe you can help with this? Wallet is 27CH7iPzsUdV22JxBL1ggfUgQTmjz14BJegTCayFGxmjgNbSMR3LEzaiyG4HQ4VuC1MM6YHpezcYTKT VGqxrrHnK5YufaA9

Thank you!