To justify surgery, the crop would need to be jammed solid with fibrous material. As long as you don't feel any significant solid mass, I would not do surgery.
For now, just treat the sour crop and forget surgery and any concern about impaction. I've a hunch that the yeast is now accounting for any fullness you detect.
For now, just treat the sour crop and forget surgery and any concern about impaction. I've a hunch that the yeast is now accounting for any fullness you detect.