Pool has taken a slight dip under 70PH. But should be back over it once my hosting facility has more capacity and my down miners are brought back online. These S9's are so unreliable 
2 of the 50x S9s I bought are hashing at 2/3 of manufacturer documented hash rate just two days after initial deployment
Luckily the warranty is there...
Btw, does anyone have anything to say about T9's - are they really substantially more reliable than S9s?