FOUND IT! :-D
This is the recipe that i like best, but everyone will probably find a combination of oils that suits their tastebuds, alone as well as in various special combinations. For example, "potato" salad is particularly good with bacon grease as one of the fats involved in the dressing....
1-2 T. lemon juice, depending on destined use and how tangy you like your mayo
1/2 t. ground mustard
1/4 t. pepper -- white pepper is the prettiest choice ;-)
1/4 t. sea salt
1/3 c. olive oil
1/3 c. avocado oil
1/3 c. MCT oil
You CAN use all-olive, but it dominates the flavor of the dressing. I haven't experimented with things like macadamia oil, but i think it would be lovely and buttery.
...And HERE is the method that turned me from a rarely-making to a routinely-making mayo chef! All i can say is WOW....