I get what you're saying about adjustability. I just may end up making the rear frame totally adjustable. As it is, I should have at least made the top shock mounts eccentric, as that would give an easy inch or so of adjustability. I might still do that.
I went over to a friend's place last night and measured the rake on his DRZ, and got a different number than any of the published ones. Oops. Then I noticed he had street tires on it, so I measured the axle heights. It turns out that the different tires change the rake by almost a full degree, so maybe I'm just obsessing at this point.