Food points.
I think the best are the non-commercial.
In olive oil you have good years and bad years.
Last year in the Mediterranean, harvest was really bad, hence the overdue price spike. Price has been stable for decades.
Taste wise, I have a friend who produces and he likes the same things you do, the bitterness and tingly sensation.
But there are different types of olives, and different way of harvesting.
Handpicked cold pressed is the way to go, then some olive quality produce better extra virgin than others in terms of flavour and colour.
I was in a greek island last week, Kefalonia, and WOW!
I did read that olive oil can be useful. It has antioxidants that protect brain cells. But it won't work if a person doesn't lead a healthy lifestyle. I took up sports and even started using organic mullein drops, a friend suggested trying
mullein drops and now I'm impressed. My lungs seem to have been reborn. It feels like I can breathe deeply.
I am myself from the south of Italy, but Greece makes me wonder. Olive trees 20 mt away from the sea shore! Vineyards too... Greece is a different world, blessed by Zeus. And the flavours... As good as the people there.