Valvoline VR-1 vs. Lucas Hot Rod oil

There is a logic to you're reasoning, as its worked for you.
But its a mistake to conclude the relationship is not real.
That's one reason we come here - to pool our knowledge and experiences.
I have seen real life changes in oil pressure, from having engines with oil temps that exceded 260*F, and also having oil blowing out the relief valve of the accusump because it was too thick. What a mess!
I also know people who have lost engines due to oil flow issues. Granted those are mostly road racing situations, but those are the people I hang with.