I was the same way u were buzz, religiously checking my air pressure on my zx750r and gsxr1000, 2 bikes one with dunlop and the other with bridegstone, making sure they were 42 and 42. Both bikes had the same symtom, as u call it (flat spot) and i could never figure out the reason. I finally learned from a local shop that the air pressure was too high in my tires, when they were putting my wheels and tires back together after the chroming. Almost 4000 miles of mostly interstate miles now and no "flat spot" on the busa tires. BTW....I trashed the tires on the ninja and gsxr , both after about 5000, mostly interstate miles. But like i said...maybe it's just us down south with different kind of roads.