Hallo Arve
No I havent tried it, its not legal in the class...exept if I do it with DBW

TC is a challenge in itself because the cars are 1300kg 650Hp cars that are rear wheel drive and if you did TC by Ign retard it would mostly run with No timing at all because of the ECU trying to get the wheelspin under control. DBW TC would be an option but Ive tried DBW TC on track cars and I dont find it fast enough and it tends to flutter when you try and increase Proportional gain to get it fast enough. My guess is that TC with DBW will be even worse on an offroad car where RPM is very choppy when its in wheelspin.
Thinking of this...maybe you can activate TC just before you shift to decrease wheelspin. If it does make some noise you could say its got to do with the GCIC

Gearshifts will be longer though
M