Wiz,
You were close again.
220 - 177.2 ( DOW from OMC ) = 42.8 not 44t. So 126 burn for 38.8 (max TOW again) = 3.25.
198.6 burn for 58.3 = 3.4 for the Bus, but 9T under MTOW.
It doesn't matter how many times you work it, the results are the same. The Boeing today could carry 64% of its ZFW, the Bus could carry 92%. Someone way above our pay grade knows what an economical load is.
The Don