This car has power. I don't think there's any understear or it's very minor. If you take off the TCS there's a lot of wheelspin and the rear will slide sometimes. I think the only problem is brakeing. Under extream brakeing the rear will slide. You can control it and drift though a corner but it's not to smooth. I'll work on it though.
THe back does slide. I'd give advice but I'm not to good with tuning. lol good none the less
lol...well I would suggest you..(crap forgot to look at setup..um) well raise the TCS and raise the rear Camber,also raise the rear Springs and lower front DF. Tell me if this helps..(sorry didn't have time to look at your setup..this was off the top of my head )
the set-up is good.. but its very unstable at high speeds at 340 the car seems to float and whalla! just like racin'... and when braking the rear skids off causing me to be out of control.
You can try to set the rear toe to 0 or less. The greater the toe in the rear, the more it will slide. If you set a negative toe, it will really keep it from breaking out, but it might induce understeer..
)