You might be surprised how much of that can be eliminated with some tuning in the transmission and converter tables. There are more then a few reasons this happens, mine would do the same thing if I try to lock the converter up under 50 with light throttle. Unfortunatly most tuners seem to spend all their time on the engine controls, and most tuning issues with autos is all in the trans settings. I can't tell you how many cars I've been in that slam gears, short shift, or bounce of the rev limiter. Just another reason I keep telling you to start tuning yourself, nobody is going to put the kind of time in that you will to get it right.