Been having the same woes with XB12 SCG. Difference being, I've fiddled with suspension settings a lot to try to sort it and to counteract the harsh ride I was getting, but to no avail. It was tracking in even minor seams in the road and generally just giving no confidence; feeling that it would just slip from under me at every turn.
I thought tyre pressures might be the issue but with all the info recommending sticking to the manufactures setting F 34 / R 36, I only strayed by a psi or two either way, with of course no effect.
Then I got to thinking, I am light; 10 1/2 stone at most, so how is it that I am being told to use the same pressures as someone twice my weight or with two up...? Surely I thought, the tyres must be manufactured to offer the best grip, handling and feedback, with a specific amount or tyre footprint on the road, which for a lighter than average rider like me, could only be achieved by dropping pressures.
So a few days ago I took the buell by the horns (pun intended), and dropped them to F 30 / R 32, and had a similar eureka moment. I feel I am at a much better starting point to now experiment with the odd psi up and down, and after finding this thread, will try the 29/31 recommended by Eddie
first.