I actually didn't have the brakelight switch bolts until just recently - with the new sintered pads the stopping power is improved, but the feel is still softer than desired. The front master is new so I doubt it needs rebuilt.
It's an 01 so it has Nissin. I've got Marzocchi 48mm forks which came off of a 2013 I believe, but the 01 caliper bolted up fine. Curious though, if there are any 4 piston calipers around that'll mate up the same. The bike is in supermoto form right now so tire grip on the street is quite good and makes locking up the rear quite difficult.