Adrian, I eligned my rear wheel with the front by using a long straight edge along the the sides of the rear tire and by taking measurements on each side of the front tire . As it turned out my belt tracks slightly against the outside of the pulley but doesn't chirp , my axle is square in the swing arm and the bike tracks down the road perfectly. You mentioned that you aligned your bike using a laser level. That sounds interesting , could you explain how you did it. I don't have a laser level but I think they are the nuts and am going to buy one .
This is just a though , but for the guy that is having tracking problems , if your swingarm bushings are worn , accurate elignment could be a problem .