The Kawi slippers, stock, still have a good bit of engine braking to them. You can adjust them to your flavor, but in comparison, my old flashed R6 felt like a 2 stroke when you would down shift at high RPM's (The engine would just scream more and more, but the clutch release did nothing to slow it down). You just aren't riding it hard enough and down shifting at high enough RPM's to notice it. To be honest, on a street bike, you shouldn't really notice much of a difference either, because if you are, you are cruising for a bruising.
That sounds like a sweet ride