I brought this up several years ago when I bought my new '08 SERK Annie.
That bike too pulled to the left. Not that it would fight you in any way, only if you were to take both hands off the bars for a few seconds to remove a bug from your glasses or something like that. At that time I could not lean to the right enough to keep it from getting out of the lane. I mentioned it to the dealer and he made a minor adjustment at the 1k mile service. It never did get totally fixed.
On my new '09 SERG it also pulls ever so slightly to the left. It's not as bad as the SERK, but still not able to keep it straight without one hand on the bars.
I truly feel that it's just a very slight adjustment to the rear axle that would fix it.
My question is this, consider that everything on your bike is correct as it should be (other than the slight pull), if you move the axle on the right side forward, would that make a bike steer more to the left or right? In otherwords if I wanted to neutralize my hands off slight pull to the left, which what would you move the axle on the right to correct it?
The reason I ask this is I would like to try this, but I'm not going to spend a lot of time on it and would like to at least tweak the axle in the correct direction the first time I make an adjustment. I will maintain proper belt tension during this adjustment.