Dr.SportsMedIN said:

The mechanism and the magnitude are separate questions.

Adding the part of the answer the thread has not reached. 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.

Correct me if the detail matters more than I have assumed.

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.

One thing that is still open after Dr.SportsMedIN’s answer:

Was that from a primary source or from a summary of one?

PeptideChemSF said:

One practical note: write down what you did and when, before you need it.

Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. Not convinced. The evidence being cited is consistent with the conclusion and also consistent with two other conclusions nobody has ruled out.

OP back with an update, since a thread like this is useless without one.

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.