I think no matter what application the Sprint Booster is used for (manual or Auto-Stick) it will take some time to relearn the car.

I'm just to the point now where I can drive this under almost any condition without making the car 'lurch' even just a little.

HDDP, if fine control is what you need, then you may be better off without it, but I'm still thinking it will help you as the 'feathering' you need to do will be in the last half of throttle movement where this thing actually has more play. I don't think it's quite 80% in the first 10% of movement as Woody states (remember 85% of statistics are made up on the spot ).

I will say the first bit of throttle response will really surprise you, but what I consider the 'control' area is wider. If I was using more power during my regular driving and not just cruising, the throttle would be past the 'twitch' area.

Again, just my thoughts with the 'Auto-Stick' version. It could very well be that the manual is WAY more aggressive, although I think it's just the learning curve everyone has to go through.