How to improve pool's luck

[dualminer_3]

Dear All,

I have installed a LTC pool and tested it for a month. It seems the share percentage is higher then expected (bad luck). The average share percentage of All Time is 117.33%. Last seven days is 134.73%.
Is this normal? Is there some works I can do to improve this number? Do I need a special wallet software for mining pool? Or may I need fine tune .conf file of litecoind?

Looking forward to any feedback. Thanks in advance!

dualminer