if you look at your log with just open office or excell, or some other spreadsheet software, you can see the data in list form.

looking at your log, bank 1 is adding 50% While bank 2 is subtracting 30%.
Either you have huge vacuum leak on one bank, exhaust leak on one or both banks, or sensor placement is wrong.
That's the only reason I can think of that would cause the banks to be off in opposite directions, assuming engine is in good healthy mechanical order.
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