I agree with a lot of the methods you mentioned; however, the belt method is the one I disagree with because it involves flipping the cube and moving pieces around the cube.
I average around 7.5-9.2 seconds 6 if its a lucky solve my PB is 3.4 seconds. The scramble was super lucky.
3x3 i average 22-25 seconds and my pb is 16.66
I'm Michael. My main event is 2x2, and my side event is 3x3. My favorite cubers are Feliks Zemdegs and Max Park. I have a Facebook page for my cubes known as Rubik's cubes with Michael. And I'm making a new YouTube channel for the page soon. If you can plz follow my Facbook page. Oh and I'm...