--variation 3 works fine but just 3% fast than xmrig
--variation 4 has a problems
Rejected by the pool.
Message from the pool: Low difficulty share
--variation 4 280% fast than xmrig
I want use --variation 4

2nodes 4 x 6267

My miners  4xOpteron 6276 128 cores
Very Fast
BUT Allmost
Rejected by the pool.
Message from the pool: Low difficulty share
Sometimes Accepted
So same as not work.