From the other side of the consultation, briefly. Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then measure again under the same conditions.

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

Dr.PeteFamMed said:

Keep the original post as written when you update it, and add the correction underneath.

Coming at Dr.PeteFamMed’s question from a different direction. The mechanism and the magnitude are separate questions. Agreeing that something happens says nothing about whether it happens enough to act on.

Happy to go further on any of that.

Adding the numbers, since they settle part of this. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.

Following on from Dr.PeteFamMed — and this may be the naive question:

What did you change at the same time, and can you separate the two now?

Moderator note: a post naming a supplier has been edited. Discuss suppliers in the review sections, not here. No action needed from anybody.