Has impaction turned sour crop but is still hungry and energetic?

[Debbie292d]

The copper sulfate will arrive tomorrow now. Would you all recommend I try that?

I don't feel anything in the crop that would be a blockage.

Here is a reply by @TwoCrows to a new member from a while ago that I saved. I thought it was helpful, should I or anyone wonder about using it. https://www.backyardchickens.com/threads/howdy-byc.1628559/post-27813675