My hashrates shown on my machines have all dropped by about 5-7%.. I was getting about 730 per 280X, now they are getting about 690kh per each or less.  The ones that were getting about 700kh before are now down around 650kh or less...

Nothing changed on my end... I'm on useast currently, temps all under 70C... just wondering if something changed server side that would cause lower rates?