I'm working out in both directions Rob, a nice R4J would be next on the list but I dont really have any more room to put anything else.
Cant take any credit for the 6K as its just how I bought it. Compared to MY 21 the engine feels a little smoother and it has a little more power! The 21 has a bit more over rev and a bit more of a step when it comes into the power but I would guess that is down to the Tyga pipes as much as anything else. The 18 feels a little bigger with a little more room, it feels high at the back which I'm presuming is down to the F3 swinging arm and shock.
I plan to keep it as it is and tidy it up as I go along. Far to many projects on the go at the moment.