UPDATE: I remembered I had a dual metered PDU that reports amps (in whole numbers) that I don't use that readout anymore. So I tried one of the S17s on that so I could measure each cord separately. It measured exactly 5 amps each on Turbo mode. Exactly being that it only reports round numbers. At my voltage that is around 1150 watts per cord. But I'm sure it is 5.x not just 5 amps. But either way, it seems to balance the load very close between the two cords.
I tested my 53TH/s pro on two separate banks on my PDU. Like yours my PDU only shows whole numbers and rounds up or down sometimes depending on the threshold. Together on the same bank both cords pull 11 amps on my 208v electric. When I plug each plug into their own bank my PDUs show 5 amp draw per plug. Im estimating its probably more around 5.5 amps so on 208v that would mean 1144 watts per plug. This is on normal mode so it looks like the PSUs split the load evenly across the two plugs.