Yep, that's why I asked the MPH question. If it's trapping at 128 with that e.t., it's all lost in the first 60'. My friends car goes 10.50/127, car weighs 3350 w/driver and 565hp. If it's not MPH in the high 120's it's not making 628 sitting in the car.
My guess is a converter that's too tight for the engine. It probably needs about/at least 5K stall to effectively use the powerband.