With WOT it spins 1st unless a grippy surface or a decline to it and the tyres are warm. Still moves along though thanks to KAAZ. 2nd always holds unless it's damp. I don't bother off the line if there's any sort of incline as I can't get enough traction. Not the greatest cars to launch IMO, but NPC carbotic happily takes a beating with slippage to spool the turbo and I've probably done 1000+ launches in the car, so confident I can get the best out of it. My power is nearing the sensible limit for these cars at <100km/h speeds without wearing MT streets or some sort of drag setup IMO. Any more and you start to shift the useable power into higher gears/speeds as you described.
Much prefer rolling drags - not just to take launch skill out of the equation, but my small turbo's E85 midrange is long and lethal. Pulls hard from 70-150 in 3rd - if I can hang with someone until that gear I will usually pull away.