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Cat removal explains the fipping on bank 1. Bank 2 high voltage may also make sense in light of the description in your first post that your trims are maxed on bank 2 (to the extent that you don't have boost?). Presumably, the DME cannot properly read the AFR for Bank 2 and is running open loop.
Again, the only explanation I can make for your continued problems is a faulty DME sensor heater driver.
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