DJ,
The insert will not change the popping on decel, it is inherent in the design of the jardine and one of the reasons I chose the jardine ti. Most of my neighbors are in their 70's and it is my duty to keep them young and off balance.
My next door neighbor just turned 81 and she has a love hate relationship with my bikes. I think if she were 40 years younger I'd have my hands full kepping her off the back of my bike.
As for torque I reccomend getting a race ecm off the shelf and a K&N. If that doesn't solve your problem maybe go with more cubic inches. All the parts you are looking for can be found at American Sport Bike.com