Decel popping is usually caused by a slightly lean de-cel condition (adding a muffler without a 'tune' will do that), or a leak in the pipe. Fix those = no popping.
There's no need for a completely custom one-off injection program and the $1000's you'll spend to get it for something that minor.
It's not magic, and these bikes haven't changed since the common programs have been available for so long now. There's lots of variables... like maybe your program isn't right? Since they have been open source for so long, how do you really know it is what they say? You get what you pay for.