I've been debating on changing the sprockets to -1 and +2 when i change my chain in the next couple months. Has anyone done this on the 13+ ? I made this change on my 07 an made a noticeable difference.
It will make a noticeable difference in acceleration. Does your bike have traction control? Some people are reporting issues with the traction control system after changing sprocket sizes on the 2013+ bikes.
Also, you can use Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator to play with different sprocket sizes and see what the changes will do.