HPLC_Greg said:

The version of this that has an answer is narrower than the version being asked.

I read this differently from HPLC_Greg, on substance rather than tone. Not convinced. The evidence being cited is consistent with the conclusion and also consistent with two other conclusions nobody has ruled out.

The figures, for anyone assembling their own picture. The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the same conditions. Nobody wants that answer and it is still the answer.

DanielChem_CHI said:

The evidence being cited is consistent with the conclusion and also consistent with two other conclusions nobody has ruled out.

Adding the part of the answer the thread has not reached. The mechanism and the magnitude are separate questions. Agreeing that something happens says nothing about whether it happens enough to act on.

Following on from emma_london — and this may be the naive question:

How long did you give it before you decided it was working?

Reporting back.

Coming back a few months on. It held. Nothing dramatic to report, which is the report.