i have this all before.
its all in the boost ramp rate and limiting power a little in lower gears (assuming tyres are decent and you arent running something silly ie -5 degrees camber on the rear).
GT35R + 235 semis and i have traction in 1st and 2nd unless its particularly cool/cold
if you can have a 2D map for boost control and run GEAR vs Revs, eg mine runs 1st 15psi, 2nd 17psi, 3rd 17 until ~100km/h and then full boost from there on.