If the miners are of the same batch, then it can be different DCRs, different intake temperatures or just difference between board ASICs. Latest FW might give you 1% more. The settings you have should work good.
I have found out, that 4 out of 8 SP10s, that are running lower hash rates, have different values in DCR:
DC2DC DCR inductor flag loop 0 (0xD0) = 0x2
DC2DC DCR inductor flag loop 1 (0xD0) = 0x2
DC2DC DCR inductor flag loop 2 (0xD0) = 0x2
DC2DC DCR inductor flag loop 3 (0xD0) = 0x2
DC2DC DCR inductor flag loop 4 (0xD0) = 0x2
DC2DC DCR inductor flag loop 5 (0xD0) = 0x2
DC2DC DCR inductor flag loop 6 (0xD0) = 0x2
DC2DC DCR inductor flag loop 7 (0xD0) = 0x2
DC2DC DCR inductor flag loop 8 (0xD0) = 0x2
DC2DC DCR inductor flag loop 9 (0xD0) = 0x2
DC2DC DCR inductor flag loop 10 (0xD0) = 0x2
DC2DC DCR inductor flag loop 11 (0xD0) = 0x2
DC2DC DCR inductor flag loop 12 (0xD0) = 0x2
DC2DC DCR inductor flag loop 13 (0xD0) = 0x2
DC2DC DCR inductor flag loop 14 (0xD0) = 0x2
DC2DC DCR inductor flag loop 15 (0xD0) = 0x2
DC2DC DCR inductor flag loop 16 (0xD0) = 0x2
DC2DC DCR inductor flag loop 17 (0xD0) = 0x2
DC2DC DCR inductor flag loop 18 (0xD0) = 0x2
DC2DC DCR inductor flag loop 19 (0xD0) = 0x2
DC2DC DCR inductor flag loop 20 (0xD0) = 0x2
DC2DC DCR inductor flag loop 21 (0xD0) = 0x2
DC2DC DCR inductor flag loop 22 (0xD0) = 0x2
DC2DC DCR inductor flag loop 23 (0xD0) = 0x2
DC2DC DCR inductor flag loop 0 (0xD0) = 0x1
DC2DC DCR inductor flag loop 1 (0xD0) = 0x1
DC2DC DCR inductor flag loop 2 (0xD0) = 0x1
DC2DC DCR inductor flag loop 3 (0xD0) = 0x1
DC2DC DCR inductor flag loop 4 (0xD0) = 0x1
DC2DC DCR inductor flag loop 5 (0xD0) = 0x1
DC2DC DCR inductor flag loop 6 (0xD0) = 0x1
DC2DC DCR inductor flag loop 7 (0xD0) = 0x1
DC2DC DCR inductor flag loop 8 (0xD0) = 0x1
DC2DC DCR inductor flag loop 9 (0xD0) = 0x1
DC2DC DCR inductor flag loop 10 (0xD0) = 0x1
DC2DC DCR inductor flag loop 11 (0xD0) = 0x1
DC2DC DCR inductor flag loop 12 (0xD0) = 0x1
DC2DC DCR inductor flag loop 13 (0xD0) = 0x1
DC2DC DCR inductor flag loop 14 (0xD0) = 0x1
DC2DC DCR inductor flag loop 15 (0xD0) = 0x1
DC2DC DCR inductor flag loop 16 (0xD0) = 0x1
DC2DC DCR inductor flag loop 17 (0xD0) = 0x1
DC2DC DCR inductor flag loop 18 (0xD0) = 0x1
DC2DC DCR inductor flag loop 19 (0xD0) = 0x1
DC2DC DCR inductor flag loop 20 (0xD0) = 0x1
DC2DC DCR inductor flag loop 21 (0xD0) = 0x1
DC2DC DCR inductor flag loop 22 (0xD0) = 0x1
DC2DC DCR inductor flag loop 23 (0xD0) = 0x1
DC2DC DCR inductor flag loop 0 (0xD0) = 0x2
DC2DC DCR inductor flag loop 1 (0xD0) = 0x2
DC2DC DCR inductor flag loop 2 (0xD0) = 0x2
DC2DC DCR inductor flag loop 3 (0xD0) = 0x2
DC2DC DCR inductor flag loop 4 (0xD0) = 0x2
DC2DC DCR inductor flag loop 5 (0xD0) = 0x2
DC2DC DCR inductor flag loop 6 (0xD0) = 0x2
DC2DC DCR inductor flag loop 7 (0xD0) = 0x2
DC2DC DCR inductor flag loop 8 (0xD0) = 0x2
DC2DC DCR inductor flag loop 9 (0xD0) = 0x2
DC2DC DCR inductor flag loop 10 (0xD0) = 0x2
DC2DC DCR inductor flag loop 11 (0xD0) = 0x2
DC2DC DCR inductor flag loop 12 (0xD0) = 0x2
DC2DC DCR inductor flag loop 13 (0xD0) = 0x2
DC2DC DCR inductor flag loop 14 (0xD0) = 0x2
DC2DC DCR inductor flag loop 15 (0xD0) = 0x2
DC2DC DCR inductor flag loop 16 (0xD0) = 0x2
DC2DC DCR inductor flag loop 17 (0xD0) = 0x2
DC2DC DCR inductor flag loop 18 (0xD0) = 0x2
DC2DC DCR inductor flag loop 19 (0xD0) = 0x2
DC2DC DCR inductor flag loop 20 (0xD0) = 0x2
DC2DC DCR inductor flag loop 21 (0xD0) = 0x2
DC2DC DCR inductor flag loop 22 (0xD0) = 0x2
DC2DC DCR inductor flag loop 23 (0xD0) = 0x2
DC2DC DCR inductor flag loop 0 (0xD0) = 0x1
DC2DC DCR inductor flag loop 1 (0xD0) = 0x1
DC2DC DCR inductor flag loop 2 (0xD0) = 0x1
DC2DC DCR inductor flag loop 3 (0xD0) = 0x1
DC2DC DCR inductor flag loop 4 (0xD0) = 0x1
DC2DC DCR inductor flag loop 5 (0xD0) = 0x1
DC2DC DCR inductor flag loop 6 (0xD0) = 0x1
DC2DC DCR inductor flag loop 7 (0xD0) = 0x1
DC2DC DCR inductor flag loop 8 (0xD0) = 0x1
DC2DC DCR inductor flag loop 9 (0xD0) = 0x1
DC2DC DCR inductor flag loop 10 (0xD0) = 0x1
DC2DC DCR inductor flag loop 11 (0xD0) = 0x1
DC2DC DCR inductor flag loop 12 (0xD0) = 0x0
DC2DC DCR inductor flag loop 13 (0xD0) = 0x0
DC2DC DCR inductor flag loop 14 (0xD0) = 0x0
DC2DC DCR inductor flag loop 15 (0xD0) = 0x0
DC2DC DCR inductor flag loop 16 (0xD0) = 0x0
DC2DC DCR inductor flag loop 17 (0xD0) = 0x0
DC2DC DCR inductor flag loop 18 (0xD0) = 0x0
DC2DC DCR inductor flag loop 19 (0xD0) = 0x0
DC2DC DCR inductor flag loop 20 (0xD0) = 0x0
DC2DC DCR inductor flag loop 21 (0xD0) = 0x0
DC2DC DCR inductor flag loop 22 (0xD0) = 0x0
DC2DC DCR inductor flag loop 23 (0xD0) = 0x0
The other 4 have all 0x0 and are hashing nicely around 1450. All 8 miners are in the same datacenter, ambient temp has dropped from 35C to 34C now.
Can you please suggest me something for this slow hashing units?
Thank you.