That's kind of irrelevant. I was suggesting that changing the BW might have an effect greater than would be expected on the basis of the current in the BW pin, which would be a clue that it was oscillating.
You have to consider then in what configuration it might run OK, say with a LME49710 or, dare I say it, an NE5532. There's nothing to suggest that the OPA211 is any more likely to be the cause. I'll check the math on the servo.
I've got 4 more 49600s arrived. I guess I'll have to build another one before I respin the board.