I modeled the noise at each test point (ignoring the LM366) and compared with the current measured data. As we already know, some of the measurements are limited by instrumental noise, so I will update these graphs as soon as I have data not limited by amplifier noise, but the current graphs support the idea that the noise of the LM366 might account for some of the difference since the measured data at TP6 (the only one independent of the LM366) coincides more closely with the model. We will see if that continues or even improves after I take new, not noise limited, data.