Even though I've had my '15 re-flashed using the Flash Tune brand at a local shop, there's still room for improvement. The on-off throttle abruptness is better but not gone. I think now rather than the fuel cut off delay, what I'm feeling is a bit too steep a response in S mode for the first few degrees for smooth riding, particularly on bumpy surfaces. I've been forcing myself to ride around town and in heavy traffic more often in S mode, so absent bumps I can control it pretty smoothly, even in 2nd at changing speeds with the clutch completely released, but it takes more concentration than I like. I've been thinking about having Anthony re-re-flash it for me.