Could you just confirm that mode 3 was selected? Should appear something like this in the beginning of output:
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#0[0] P104-100
yup
Optimisation: oc1[0 1 2 3 4 5 6 7 8]
Temp. limit: [90°C]
miniZ<150,5,3>[3:1:00:5998]: Selecting GPU#6[6] P106-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#7[7] P104-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#2[2] P104-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#8[8] P104-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#3[3] P104-100
miniZ<150,5,3>[3:1:00:5998]: Selecting GPU#4[4] P106-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#0[0] P104-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#1[1] P104-100
miniZ<150,5,3>[3:1:00:3933]: Selecting GPU#5[5] P104-100
GPU Bus load, reported by GPU-Z, also varies from 7 to 16%, with worst performing GPUs using less bus bandwidth.