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If you insert a follower ahead of R8, inline with the bottom-most conductor in your drawing, that should go a long way to solving your problem. Never mind my question about the probe. I went back to post #35 and got the answer.
I think the oscillation is caused by U1A. The capacitor phase-shifts the feedback signal, which at 180 degrees will apply positive feedback to the control amp. Before you added the 2nd follower, maybe you were attenuating the feedback signal so you weren't getting the oscillations.
The green signal clips by the blue signal. I need to figure out how to keep the blue signal grounded without affecting the rest of the circuit...
The blue signal is not grounded because U3A is overloading as I described earlier. It should have a gain of 1, but it's over 1 because U5A is loading the output of U3A. What is Vbias? Can you put labels on your schematic that correspond to your signal names?
Any possible way of getting around U5A overloading U3A to keep the blue signal grounded?
Yes. Use a follower.