Updated 12/27/2010 1:48 AM
Firstly I'd just like to say it's good seeing another aussie having a go.
I've tried out your tune at Nurburgring since I didn't know where you tuned, plus it's a road tune so Nurburgring is a good place to go.
Some things I'd like to clear up on your setup's page settings though. With the parts you have posted the power is not 378hp but more around 395hp, so please check if you've posted the correct stuff. Also your setting figures for the wing on the rear cannot be 33 as the top figure I could get to is 30, so you'll need to fix that too.
Now on your setup.
After driving the car around Nurburgring there were some good points to your tune. I found the gearbox to be well set, but I would have found it better if the gears were set more closely. Also the car could change it's direction well at low speeds.
But there were downsides to the tune. For instance when I was testing the car for the first time around Nurburgring it's so unstable, that at high speed corners I spun out, and that wasn't even driving absolutely on the edge. To give you an example of how unruly I found it to be, I spun out 3 times on my first attempt of a lap around the ring. Even on low speed corners at times, the rear would simply whip around and countersteering would make things worse as the car would lose all it's grip.
Something that I might just be nit picking at though as some of the stuff your upgraded the car with. Increasing Rigidity isn't necessary at all and it costs $30000, so that might be something you want to consider. You could spend that $30000 on port polishing the engine (which is good since your running a N/A engine) and engine balancing it. Also I understand that your tune is running on R3's (racing medium tyres) since you couldn't find enough grip at times. But if you can set the suspension up better and use appropriate settings on the LSD, you could run on racing hard's or even sports soft, resulting in less costs.
I think the main issue with this tune is cornering and stability. You need to balance out the 2 so that you can get the best out of this car. A tip I can give you is check your suspension settings. The car is a MR (mid engine rear drive) car so you need to tune to those specifications specifically. If you tune it properly the car should handle much better.