Hmm, that's very interesting. This may explain why a prefer a quick comparison in a familiar system, without a lot of back and forth. I also like the mode of comparing over a long time, listening to a wide variety and then make a system change and track through much of the same material.
Yes, I think you are correct. I also do very few back and forths at one time; a few each day, for weeks and even months.
Nice info Dave.