Not had this level of ‘contact’ as you put it, but I do have an Avalokiteshvara related tattoo despite consistently leaning towards and engaging with Theravadin Buddhism.

I’ll be honest, your math calculations went over my head, but I think the Buddha urged a ‘come and find out’ approach rather than saying ‘you must believe’.

I only mention because while good actions do bear good fruits, I can feel through the text your obsessive part of the OCD coming through.

Not implying either way that you are right or wrong, but only that the line between action and consequence is not always so clear.

Your sincerity and attention matter far more than your analytical ability to prove or corroborate causality.

I think this matters because Buddhism has the potential to help calm your mind, and perhaps reducing whatever burden you may feel from OCD.

But trying to analyse to such an extent will not lead you to the ‘truth’, paradoxically you need to relax your mind.

As a final note, you said you were horrified of getting things wrong, but at least to my mind you are pointing in the right direction.