Nope, you're on the right track. A tune will usually improve a bit once you get a few drive cycles in on it (tank of gas or 2) as the ECU starts exploring the limits with its new parameters. It works the same as a stock ECU; reset it, and it's going to start with base parameters and adjust things like timing, etc, in order to maximize performance.
Like Nick said, a good tune is a good tune. Following up a good dyno tune with a full road tune is ususally not necessary, becuase you're really duplicating effort; however, after we dyno tune, we'll always rip the car around a bit to make sure everything works as expected on the road, and make any fine adjustments necessary at that time. Performance ont he road is what matters; using the dyno gives us a repeatable environment where we can accurately track and respond to changes while tuning, which is where the value of the dyno really comes in.
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