With hot engine and lambda system operating in closed loop state, ... now at idle turn the CO screw in a way so the duty cycle swings around 50 and 55 %.
With that setting what AFR is shown on your AFR gauge at a) idle? and what AFR at b) WOT / High load
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The ecu does not know what exhaust I have or where the O2 is plugged in
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Thought too simply ... The ECU itself surely not, but the oxygen amount in that area of the exhaust system where the sensor is installed to can be affected by several things, as described. Like air leaks in the exhaust system etc.. And that "will" affect the sensors reading, .. as well as a non proper operating temperature of the sensor, even with a heated wideband model. Cause heater of heated sensors do help for faster self initializing, but the target operating temp will be achieved and kept by the exhaust flow temperature.