You might also check your heatshield.I went nearly berserk for over a month, searching for a similar sound, fearing the worst, as is common. Ultimately I found the slip that holds the front of the heatshield to the exhaust had broken off. That was the initial sound and after it fell off it was the front of the shield hitting the exhaust while revving and braking. Just a quick look.
I doubt if it is the valve adjustment. On the UCE bikes, there isn't any because the hydraulic valve lifters don't need it.