Cams are not worth trying to modify yourself.. IF, big IF, you can buy what you want..
Once you cant buy it, the game changes.. Be nice if you could start off with a fresh blank, but they may not exist for 550s.
One thing that may work/help, if the base circle is bigger, is the 650 cam..
Without people experimenting with their own cams we would not have 1/2 the cam grinders out there.. (for cars), and would not see accomplishments the likes of Burt Munro...
Sorta reminds me of the local guy that just majorly reworked and changed directions of the ports on a late V-twin engine, with Keihin carbs, that should make between 170-190 hp..