My '09 has always been a slug off the line due to the stepped up drive ratio. I would have to slip the clutch a lot riding two up and when going slow, the bike was too fast without pulling in the clutch a bit here and there.
But once moving it wasn't too bad.
I did change out the 32t trans drive sprocket with a 30t. I decided to retain the stock belt so I was forced to do the swingarm adjustment slot modification. Having the necessary tools and welder in my home garage and a table lift, made this a nice weekend job. The hardest part was removing the retaining nut on the trans sprocket. Had to make up a deep socket to do this. Also bent a 3/4" breaker bar with a 5' pipe on the end just to break loose the nut. Also heated the nut and finally the red Loctite broke loose.
After the install of the 30t sprocket, my bike, one up or two up, became so much more ride-able at lower speeds. It was a HUGE improvement for the investment. I gained about 300 rpms in each gear versus the old mph speeds/rpms. But 6th gear is now very usable, even down in the 50 mph range. And taking off in 1st is not an issue anymore, no need for as much clutch feathering.
I agree tuning with the TTS is a good option. I have the TTS on mine, but have not played with the adjustments as mentioned above. But over all of my mods, the 30t conversion was the most bang for the buck and VERY noticeable in use.
Good luck and let us know how it works out for you.