Trust me when I say that if anything benchmark related comes out of Menthol's mouth......or keyboard entry you should take note and move on. Go look at virtually every leader board for every benchmark know to man and you will see Menthol in the top 10 if not #1. Only one Ive seen more consistent with the 1 spot is Kingpin who does LN2 or He to go WAY subzero and will spend days if not weeks and thousands of $$ on perfecting a single run.
Too many variables affest the scores and test 2 is the most intensive of the two. Do you have other things running, is drive indexing active, is AV on, how many background proccesses are running...I can go on forever. Something as simple as a background service starting while the bench is running changes everything.
Personally when Im doing bench runs, Like Menthol stated, I go with a fresh boot using selective start up with as few services as I can get away with, if safe mode would work id do that. Then I leave it sit a minute or two after the boot for services to settle. Got a window open? Thats a hit. Too many icons on your desktop? Thats a hit. Gsync enabled? Thats a hit. Web browser open? Thats a hit. Anything but a black background on your desktop....thats a hit. I can go on for an hour or more.....Even little hits add up.....Even the Aorus GPU pi$$ing off the ASUS MOBO.
Cant help you much if you dont use a score from a standard test instead of a modified one that give you ZERO

“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein