The problem with tuning, or at least fine tuning is that it is quite a complex task. The proper way to tune a car is with the use of a chassis dynometer. That way, you can see actual power output whilst logging important parameters, to see the result of each tweak.
For a pretty good book about tuning, try
http://www.amazon.com/Engine-Managem...pr_product_top
Don't expect to even do too much on the proceed when it comes to tuning, as even the authorised tuners and resellers barely touch any settings. This is because the proceed does have an auto learning / tuning feature that will always try to get the best out of your car based on it's own datalogging.
Without changing boost and fuelling, I hit 297.5 kw which is a really good number. User JB4135 extensively working on fuelling algorithms in the JB4 tune, he was able to extract significantly higher numbers than that.
It would be great if you do get to learn alot about the proceed, as we are always told the tune will auto-tune and never really get much more out of vishnu than that. I would love to eventually fine tune the car to get every last bit of power.