Stubborn 02 issues

SonicVQ

All your codes indicate the rear O2 sensor output voltage is too high/low and too slow to respond. There is no indication/codes the rear o2 sensor heater is not functioning.
With the bank 1 02 sensor output of 0v, check the wiring for damage. You could swap the rear O2 sensors to see if the problem changes sides. If is does, the O2 sensor is bad.

With test pipes, it can be difficult for all the monitors to run to completion and pass... after all the system is designed to verify catalytic converter function and you don't have one.

If you don't have "O2 defoulers/extenders" installed on the test pipes, the catalyst monitor will never run to completion and pass.