I totally need some guidance to optimize my miners.I don't know what to do anymore.

Dual E5-2680v2(2*CPU=20 cores/40threads) system gets between 900-1100H/s. Win7.64GB memory
Running Hodlminer-avx

Dual E5-2680v4(2*CPU=28 cores/56threads) system gets 600H/s.Win7.64GB memory.
Running Hodlminer-avx2

Where to even begin with???

I read something about setting affinity values in hex.But how to set them for dual cpu systems?Should I start two(2) miners?