I wouldn't put a whole lot of faith in some of those on-board performance displays. While they may be good at pulling some of the OBD data from the ECU, I doubt they are very accurate in other areas.
So glad you are happy with the results and the performance of this tune. It's been a long road for you, but it sound's like you finally got what you were after.
A good set of summer tires will make a substantial difference. A set of good Michelin or Conti's will make a huge difference in not only the acceleration but also the braking and overall grip. From my experience, mid-tier summers may not have much more grip than a set of really good all seasons, but moving up to the next level will be noticeable.