It seems it is from OC settings, try and see what happens with 0 OC. Also because you mixed different types of gpus on the same rig, intensity is also problematic. try to lower all cpu, memory and intensity and also use EWBF because has a similar hasd rate on equihash.
Miner02 has six identical Zotac 1060 3GB cards in it. Miner09 has six identical EVGA 1060 3GB cards in it. So those 2 rigs have identical cards, as do most other rigs, but yes, there are a few exceptions.
I have dialed back to 0 OC now and will run like that to see if the issue goes away. I'll also give EWBF a shot. I was running that before DSTM came out. EWBF seems to have been abandoned by its author, which is the main reason I switched.
Thanks!