wendy_avl said:

Practical: whatever you change, write down the date and the reason.

This is where I part company with the consensus forming above. I would resist the confidence. Half of what this board was certain about two years ago has since been quietly dropped, and nobody went back to correct the threads.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

wendy_avl said:

Practical: whatever you change, write down the date and the reason.

Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.

wendy_avl said:

Practical: whatever you change, write down the date and the reason.

This answered a question I did not know how to ask. Adding it to my notes with a link back to this thread.

Clinical perspective, offered as context rather than as advice. The useful move here is to separate what is established from what is widely repeated. Those two sets overlap less than the confident tone of most write-ups suggests, and the second set is where nearly all the disagreement on this board comes from.

Reporting back.

Reporting back with a partial result, because a partial result is still better than silence. Two of the three things suggested helped; I cannot separate them and I am not going to pretend otherwise.