Lost my expert license long ago  (in a previous life actually)

I know as much as you do, that there is now a firm indicator that it was not the rue.

To be even more sure you could repeat that test just once more, if same again then you can start to trust the rue completely. Is what I should do in your place.

If all OK, then on another day I would do that same rue again plus only half the amount mimo that gave the painful session, meaning 3.5 gr mimo bark brew. Or if you want to be even more cautious just 2 gr mimo brew. Checking out the waters.

Chances are that you had an odd abdominal issue that will not repeat again easily, but I would not challenge this with too much mimo at once again. Just my thoughts.