To my knowledge, none of the manufacturers, such as Dynojet Power Commander, etc were able to come up with something that would work on the ST1300 injection system. As I said, it was just a matter of me developing a smooth throttle hand when rolling off of closed throttle and I no longer noticed it, so it wasn't a problem. Now, if I understand you, however, you may have experienced a "dead spot" on first opening the throttle and then a sudden lurch or something like that? If so, that is a different problem. With the ST1300 it was more of a sensation of instant throttle response when coming off of closed throttle, no delay at all.