H20 I have the same Rig as you... 2 7970's. If I can be of any help or you need me to try anything just let me know... Here to help..
Been hashing here for about 36 hours, seeing earnings at or slightly above LTC mining.
Rejects from 8%-12%. My rigs are 4x7950 per box and my ping to the pool is 35ms.
Any suggestions h2odysee?
I wish I had an answer.
My rig is 2 7970s. I never really go above 3% rejects + stales. My ping is 45 ms.
This probably doesn't help any, but here are my 7970 settings:
"auto-fan" : true,
"gpu-fan" : "0-75",
"temp-target" : "72",
"intensity" : "13",
"gpu-threads" : "2",
"gpu-engine" : "1090",
"gpu-memclock" : "1500",
"thread-concurrency" : "8192"
I do have plans to lower server load, and do more seamless coin switching. And I may do a lower difficulty test.