I'm glad you posted this, because I've been thinking this alot lately too.
I 'generally' followed the brakein procedure to 1500, with just a couple sprints to about 100, and no more than 4500 rpm.
Now after about 3 months, I am gettin into it more, and can definitely feel it be more responsive and more consistent.
It especially SHIFTS smoother, and with less 'chunk'.
Try the PTM modes, they are very interesting when driving around town, taking corners and blasting out, etc. I usually drive in 3 now, like it best. You can notice a subtle difference between them, and it lets you play with your toy more.