I'd like to point out that different corners and surfaces require far different body position. A slow tight corner is far different than a fast sweeper. Toss in wet pavement or dirt and you'll get even more.
I used to think that leaning way off was faster in every corner till I got passed by some insainly fast supermoto bikes with the rider leaned way the wrong way and the bar nearly touching the ground. I did not understand how that worked till I rode on the ice this winter. It works well.
