I use the DS3 as well, but I drive in the standard setup from GT4, with the sticks. By now I turn all aids off, but that took a while. As you say, turning off TCS is probably the biggest difference. If I have learned anything from RKM's tunes in the tuning forum, it's that for whatever reason, turning down the LSD all the way to 5 in the settings helps with wheel spin, if your suspension is setup right. At least in my head.
In short: you can kind of compensate the loss of traction when you use TCS 0 by tuning and adjusting the settings of our car. Takes more time though.