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I think you've got to base it off of your largest load.I'm looking at feeding three 480-volt single-phase loads. The loads are not even, so it will not be possible to balance the loads.
A-B = 155A
B-C = 320A
A-C = 210A
What would the total load be on the 3-phase feeder with all 3 single-phase loads on?
I came up with
A = 189A
B = 299A
C = 292A
Of course the amperage on B phase would go up if the A-B load was turned off.