Unless you are on the track, try not to worry so much about how far down you get it on the street.
I used to worry about my 3/4 inch "chicken-strips" on either side of my rear tire on my F4 and I was always trying to lean hard to wear those out on the street.
Well one day while leaned way over, some cager decided he had enough time to jump out in front of me from a side street while I was hard in the corner, and I just barely managed to miss him, but nearly totalled my F4 in the process ($5500 worth of damage).
I now have my fixed F4 back, but I've realized that I have no business getting that leaned over on the street.
If you really want to lean the bike over, go on the track where you're sure there's no gravel or idiot cagers, if you keep trying to drag the hero blobs on the street one day you might run into gravel or an idiot cager like I did, and the consequenses are not pretty.
I'm now more concerned with enjoying the fact that I can still enjoy and ride my F4 and someday I will wear out the last edges of the tires on the track under controlled circumstances.
Hope you don't have to learn that lesson in such a hard way.
Joao "John" Silva
"If my F4 is supposed to be comfortable on long trips I'd hate to feel my ass after 400 miles on an R6"