Another little trick to smooth out shifting is to blip the throttle while clutching to match engine and transmission speeds while going down the gears. In a race car, it's called heel/toe shifting and the idea (in a car) is to brake with the big toe of your right foot, then angle your heel over to the gas pedal to rev the car at the same time as you push in the clutch, shift down, and then re-engage the clutch. It's way easier on a bike. Brake with two fingers, pull in the clutch lever, blip the throttle up about 500 revs or so at the same time as you're shifting down, then release clutch. Repeat down through the gears. It's a whole lot easier to do than it is to describe! The whole process takes about 1 second. Forgive me if you already know this, but for those who don't it can be a big help. This technique also allows you to maximize the use of engine braking.